diff --git a/Octokit.Tests/Clients/PullRequestsClientTests.cs b/Octokit.Tests/Clients/PullRequestsClientTests.cs
new file mode 100644
index 00000000..4a81fe96
--- /dev/null
+++ b/Octokit.Tests/Clients/PullRequestsClientTests.cs
@@ -0,0 +1,146 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using NSubstitute;
+using Octokit;
+using Octokit.Tests.Helpers;
+using Xunit;
+
+namespace Octokit.Tests.Clients
+{
+    public class PullRequestsClientTests
+    {
+        public class TheGetMethod
+        {
+            [Fact]
+            public void RequestsCorrectUrl()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PullRequestsClient(connection);
+
+                client.Get("fake", "repo", 42);
+
+                connection.Received().Get<PullRequest>(Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/pulls/42"),
+                    null);
+            }
+
+            [Fact]
+            public async Task EnsuresNonNullArguments()
+            {
+                var client = new PullRequestsClient(Substitute.For<IApiConnection>());
+
+                await AssertEx.Throws<ArgumentNullException>(async () => await client.Get(null, "name", 1));
+                await AssertEx.Throws<ArgumentNullException>(async () => await client.Get("owner", null, 1));
+                await AssertEx.Throws<ArgumentException>(async () => await client.Get(null, "", 1));
+                await AssertEx.Throws<ArgumentException>(async () => await client.Get("", null, 1));
+            }
+        }
+
+        public class TheGetForRepositoryMethod
+        {
+            [Fact]
+            public async Task RequestsCorrectUrl()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PullRequestsClient(connection);
+
+                await client.GetForRepository("fake", "repo");
+
+                connection.Received().GetAll<PullRequest>(Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/pulls"),
+                    Arg.Any<Dictionary<string, string>>());
+            }
+
+            [Fact]
+            public void SendsAppropriateParameters()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PullRequestsClient(connection);
+
+                client.GetForRepository("fake", "repo", new PullRequestRequest { Head = "user:ref-head", Base = "fake_base_branch"  });
+
+                connection.Received().GetAll<PullRequest>(Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/pulls"),
+                    Arg.Is<Dictionary<string, string>>(d => d.Count == 3
+                        && d["head"] == "user:ref-head"
+                        && d["state"] == "open"
+                        && d["base"] == "fake_base_branch"));
+            }
+        }
+
+        public class TheCreateMethod
+        {
+            [Fact]
+            public void PostsToCorrectUrl()
+            {
+                var newPullRequest = new NewPullRequest("some title");
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PullRequestsClient(connection);
+
+                client.Create("fake", "repo", newPullRequest);
+
+                connection.Received().Post<PullRequest>(Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/pulls"),
+                    newPullRequest);
+            }
+
+            [Fact]
+            public async Task EnsuresArgumentsNotNull()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PullRequestsClient(connection);
+
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create(null, "name", new NewPullRequest("title")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("", "name", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", null, new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("owner", "", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", "name", null));
+            }
+        }
+
+        public class TheUpdateMethod
+        {
+            [Fact]
+            public void PostsToCorrectUrl()
+            {
+                var pullRequestUpdate = new PullRequestUpdate();
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PullRequestsClient(connection);
+
+                client.Update("fake", "repo", 42, pullRequestUpdate);
+
+                connection.Received().Patch<PullRequest>(Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/pulls/42"),
+                    pullRequestUpdate);
+            }
+
+            [Fact]
+            public async Task EnsuresArgumentsNotNull()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new PullRequestsClient(connection);
+
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create(null, "name", new NewPullRequest("title")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("", "name", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", null, new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("owner", "", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", "name", null));
+            }
+        }
+
+        public class TheCtor
+        {
+            [Fact]
+            public void EnsuresArgument()
+            {
+                Assert.Throws<ArgumentNullException>(() => new PullRequestsClient(null));
+            }
+        }
+    }
+}
diff --git a/Octokit.Tests/Models/PullRequestRequestTests.cs b/Octokit.Tests/Models/PullRequestRequestTests.cs
new file mode 100644
index 00000000..51fb7714
--- /dev/null
+++ b/Octokit.Tests/Models/PullRequestRequestTests.cs
@@ -0,0 +1,35 @@
+using Octokit;
+using Xunit;
+
+public class PullRequestRequestTests
+{
+    public class TheToParametersDictionaryMethod
+    {
+        [Fact]
+        public void ContainsSetValues()
+        {
+            var request = new PullRequestRequest
+            {
+                State = ItemState.Closed,
+                Head = "user:ref-name",
+                Base = "fake_base_branch"
+            };
+
+            var parameters = request.ToParametersDictionary();
+
+            Assert.Equal("closed", parameters["state"]);
+            Assert.Equal("user:ref-name", parameters["head"]);
+            Assert.Equal("fake_base_branch", parameters["base"]);
+        }
+
+        [Fact]
+        public void ReturnsDefaultValuesForDefaultRequest()
+        {
+            var request = new PullRequestRequest();
+
+            var parameters = request.ToParametersDictionary();
+
+            Assert.Equal("open", parameters["state"]);
+        }
+    }
+}
diff --git a/Octokit.Tests/OctoKit.Tests-NetCore45.csproj b/Octokit.Tests/OctoKit.Tests-NetCore45.csproj
index 2e4c8ce9..351d9303 100644
--- a/Octokit.Tests/OctoKit.Tests-NetCore45.csproj
+++ b/Octokit.Tests/OctoKit.Tests-NetCore45.csproj
@@ -66,6 +66,7 @@
     <Compile Include="Clients\MiscellaneousClientTests.cs" />
     <Compile Include="Clients\NotificationsClientTests.cs" />
     <Compile Include="Clients\OrganizationMembersClientTests.cs" />
+    <Compile Include="Clients\PullRequestsClientTests.cs" />
     <Compile Include="Clients\ReleasesClientTests.cs" />
     <Compile Include="Clients\SshKeysClientTests.cs" />
     <Compile Include="Clients\StarredClientTests.cs" />
diff --git a/Octokit.Tests/Octokit.Tests.csproj b/Octokit.Tests/Octokit.Tests.csproj
index 9b4eda2c..711cb418 100644
--- a/Octokit.Tests/Octokit.Tests.csproj
+++ b/Octokit.Tests/Octokit.Tests.csproj
@@ -76,6 +76,7 @@
     <Compile Include="Clients\TeamsClientTests.cs" />
     <Compile Include="Clients\GitDatabaseClientTests.cs" />
     <Compile Include="Clients\OrganizationMembersClientTests.cs" />
+    <Compile Include="Clients\PullRequestsClientTests.cs" />
     <Compile Include="Clients\TagsClientTests.cs" />
     <Compile Include="Clients\IssuesEventsClientTests.cs" />
     <Compile Include="Clients\IssueCommentsClientTests.cs" />
@@ -121,6 +122,7 @@
     <Compile Include="Models\MilestoneRequestTests.cs" />
     <Compile Include="Models\IssueRequestTests.cs" />
     <Compile Include="Models\ModelExtensionsTests.cs" />
+    <Compile Include="Models\PullRequestRequestTests.cs" />
     <Compile Include="Models\ReadOnlyPagedCollectionTests.cs" />
     <Compile Include="Models\RequestParametersTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -134,6 +136,7 @@
     <Compile Include="Reactive\ObservableIssuesClientTests.cs" />
     <Compile Include="Reactive\ObservableMilestonesClientTests.cs" />
     <Compile Include="Reactive\ObservableOrganizationMembersClientTests.cs" />
+    <Compile Include="Reactive\ObservablePullRequestsClientTests.cs" />
     <Compile Include="Reactive\ObservableRepositoriesClientTests.cs" />
     <Compile Include="Reactive\ObservableStarredClientTests.cs" />
     <Compile Include="Reactive\ObservableTreesClientTests.cs" />
diff --git a/Octokit.Tests/Reactive/ObservablePullRequestsClientTests.cs b/Octokit.Tests/Reactive/ObservablePullRequestsClientTests.cs
new file mode 100644
index 00000000..f1428853
--- /dev/null
+++ b/Octokit.Tests/Reactive/ObservablePullRequestsClientTests.cs
@@ -0,0 +1,234 @@
+using System;
+using System.Collections.Generic;
+using System.Reactive.Linq;
+using System.Threading.Tasks;
+using NSubstitute;
+using Octokit;
+using Octokit.Internal;
+using Octokit.Reactive.Clients;
+using Octokit.Tests.Helpers;
+using Xunit;
+
+namespace Octokit.Tests.Reactive
+{
+    public class ObservablePullRequestsClientTests
+    {
+        public class TheGetMethod
+        {
+            [Fact]
+            public void GetsFromClientIssueMilestone()
+            {
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservablePullRequestsClient(gitHubClient);
+
+                client.Get("fake", "repo", 42);
+
+                gitHubClient.Repository.PullRequest.Received().Get("fake", "repo", 42);
+            }
+
+            [Fact]
+            public async Task EnsuresNonNullArguments()
+            {
+                var client = new ObservablePullRequestsClient(Substitute.For<IGitHubClient>());
+
+                await AssertEx.Throws<ArgumentNullException>(async () => await client.Get(null, "name", 1));
+                await AssertEx.Throws<ArgumentNullException>(async () => await client.Get("owner", null, 1));
+                await AssertEx.Throws<ArgumentException>(async () => await client.Get(null, "", 1));
+                await AssertEx.Throws<ArgumentException>(async () => await client.Get("", null, 1));
+            }
+        }
+
+        public class TheGetForRepositoryMethod
+        {
+            [Fact]
+            public void ReturnsEveryPageOfMilestones()
+            {
+                var firstPageUrl = new Uri("repos/fake/repo/pulls", UriKind.Relative);
+                var secondPageUrl = new Uri("https://example.com/page/2");
+                var firstPageLinks = new Dictionary<string, Uri> { { "next", secondPageUrl } };
+                var firstPageResponse = new ApiResponse<List<PullRequest>>
+                {
+                    BodyAsObject = new List<PullRequest>
+                    {
+                        new PullRequest {Number = 1},
+                        new PullRequest {Number = 2},
+                        new PullRequest {Number = 3},
+                    },
+                    ApiInfo = CreateApiInfo(firstPageLinks)
+                };
+                var thirdPageUrl = new Uri("https://example.com/page/3");
+                var secondPageLinks = new Dictionary<string, Uri> { { "next", thirdPageUrl } };
+                var secondPageResponse = new ApiResponse<List<PullRequest>>
+                {
+                    BodyAsObject = new List<PullRequest>
+                    {
+                        new PullRequest {Number = 4},
+                        new PullRequest {Number = 5},
+                        new PullRequest {Number = 6},
+                    },
+                    ApiInfo = CreateApiInfo(secondPageLinks)
+                };
+                var lastPageResponse = new ApiResponse<List<PullRequest>>
+                {
+                    BodyAsObject = new List<PullRequest>
+                    {
+                        new PullRequest {Number = 7},
+                    },
+                    ApiInfo = CreateApiInfo(new Dictionary<string, Uri>())
+                };
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                gitHubClient.Connection.GetAsync<List<PullRequest>>(firstPageUrl, null, null)
+                    .Returns(Task.Factory.StartNew<IResponse<List<PullRequest>>>(() => firstPageResponse));
+                gitHubClient.Connection.GetAsync<List<PullRequest>>(secondPageUrl, null, null)
+                    .Returns(Task.Factory.StartNew<IResponse<List<PullRequest>>>(() => secondPageResponse));
+                gitHubClient.Connection.GetAsync<List<PullRequest>>(thirdPageUrl, null, null)
+                    .Returns(Task.Factory.StartNew<IResponse<List<PullRequest>>>(() => lastPageResponse));
+                var client = new ObservablePullRequestsClient(gitHubClient);
+
+                var results = client.GetForRepository("fake", "repo").ToArray().Wait();
+
+                Assert.Equal(7, results.Length);
+                Assert.Equal(firstPageResponse.BodyAsObject[0].Number, results[0].Number);
+                Assert.Equal(secondPageResponse.BodyAsObject[1].Number, results[4].Number);
+                Assert.Equal(lastPageResponse.BodyAsObject[0].Number, results[6].Number);
+            }
+
+            [Fact]
+            public void SendsAppropriateParameters()
+            {
+                var firstPageUrl = new Uri("repos/fake/repo/pulls", UriKind.Relative);
+                var secondPageUrl = new Uri("https://example.com/page/2");
+                var firstPageLinks = new Dictionary<string, Uri> { { "next", secondPageUrl } };
+                var firstPageResponse = new ApiResponse<List<PullRequest>>
+                {
+                    BodyAsObject = new List<PullRequest>
+                    {
+                        new PullRequest {Number = 1},
+                        new PullRequest {Number = 2},
+                        new PullRequest {Number = 3},
+                    },
+                    ApiInfo = CreateApiInfo(firstPageLinks)
+                };
+                var thirdPageUrl = new Uri("https://example.com/page/3");
+                var secondPageLinks = new Dictionary<string, Uri> { { "next", thirdPageUrl } };
+                var secondPageResponse = new ApiResponse<List<PullRequest>>
+                {
+                    BodyAsObject = new List<PullRequest>
+                    {
+                        new PullRequest {Number = 4},
+                        new PullRequest {Number = 5},
+                        new PullRequest {Number = 6},
+                    },
+                    ApiInfo = CreateApiInfo(secondPageLinks)
+                };
+                var lastPageResponse = new ApiResponse<List<PullRequest>>
+                {
+                    BodyAsObject = new List<PullRequest>
+                    {
+                        new PullRequest {Number = 7},
+                    },
+                    ApiInfo = CreateApiInfo(new Dictionary<string, Uri>())
+                };
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                gitHubClient.Connection.GetAsync<List<PullRequest>>(Arg.Is(firstPageUrl),
+                    Arg.Is<Dictionary<string, string>>(d => d.Count == 3
+                        && d["head"] == "user:ref-name"
+                        && d["state"] == "open"
+                        && d["base"] == "fake_base_branch"), Arg.Any<string>())
+                    .Returns(Task.Factory.StartNew<IResponse<List<PullRequest>>>(() => firstPageResponse));
+                gitHubClient.Connection.GetAsync<List<PullRequest>>(secondPageUrl, null, null)
+                    .Returns(Task.Factory.StartNew<IResponse<List<PullRequest>>>(() => secondPageResponse));
+                gitHubClient.Connection.GetAsync<List<PullRequest>>(thirdPageUrl, null, null)
+                    .Returns(Task.Factory.StartNew<IResponse<List<PullRequest>>>(() => lastPageResponse));
+                var client = new ObservablePullRequestsClient(gitHubClient);
+
+                var results = client.GetForRepository("fake", "repo", new PullRequestRequest { Head = "user:ref-name", Base = "fake_base_branch" }).ToArray().Wait();
+
+                Assert.Equal(7, results.Length);
+                Assert.Equal(firstPageResponse.BodyAsObject[0].Number, results[0].Number);
+                Assert.Equal(secondPageResponse.BodyAsObject[1].Number, results[4].Number);
+                Assert.Equal(lastPageResponse.BodyAsObject[0].Number, results[6].Number);
+            }
+        }
+
+        public class TheCreateMethod
+        {
+            [Fact]
+            public void CreatesFromClientIssueMilestone()
+            {
+                var newPullRequest = new NewPullRequest("some title");
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservablePullRequestsClient(gitHubClient);
+
+                client.Create("fake", "repo", newPullRequest);
+
+                gitHubClient.Repository.PullRequest.Received().Create("fake", "repo", newPullRequest);
+            }
+
+            [Fact]
+            public async Task EnsuresArgumentsNotNull()
+            {
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservablePullRequestsClient(gitHubClient);
+
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create(null, "name", new NewPullRequest("title")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("", "name", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", null, new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("owner", "", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", "name", null));
+            }
+        }
+
+        public class TheUpdateMethod
+        {
+            [Fact]
+            public void UpdatesClientIssueMilestone()
+            {
+                var pullRequestUpdate = new PullRequestUpdate();
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservablePullRequestsClient(gitHubClient);
+
+                client.Update("fake", "repo", 42, pullRequestUpdate);
+
+                gitHubClient.Repository.PullRequest.Received().Update("fake", "repo", 42, pullRequestUpdate);
+            }
+
+            [Fact]
+            public async Task EnsuresArgumentsNotNull()
+            {
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservablePullRequestsClient(gitHubClient);
+
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create(null, "name", new NewPullRequest("title")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("", "name", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", null, new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentException>(async () => await
+                    client.Create("owner", "", new NewPullRequest("x")));
+                AssertEx.Throws<ArgumentNullException>(async () => await
+                    client.Create("owner", "name", null));
+            }
+        }
+
+        public class TheCtor
+        {
+            [Fact]
+            public void EnsuresArgument()
+            {
+                Assert.Throws<ArgumentNullException>(() => new PullRequestsClient(null));
+            }
+        }
+
+        static ApiInfo CreateApiInfo(IDictionary<string, Uri> links)
+        {
+            return new ApiInfo(links, new List<string>(), new List<string>(), "etag", new RateLimit(new Dictionary<string, string>()));
+        }
+    }
+}
diff --git a/Octokit/Octokit-Mono.csproj b/Octokit/Octokit-Mono.csproj
index dccb201c..cc5f23f8 100644
--- a/Octokit/Octokit-Mono.csproj
+++ b/Octokit/Octokit-Mono.csproj
@@ -60,6 +60,7 @@
     <Compile Include="Clients\IIssuesLabelsClient.cs" />
     <Compile Include="Clients\IOrganizationMembersClient.cs" />
     <Compile Include="Clients\IReferencesClient.cs" />
+    <Compile Include="Clients\IPullRequestsClient.cs" />
     <Compile Include="Clients\IssueCommentsClient.cs" />
     <Compile Include="Clients\IssuesClient.cs" />
     <Compile Include="Clients\IssuesEventsClient.cs" />
@@ -73,6 +74,7 @@
     <Compile Include="Clients\OrganizationMembersClient.cs" />
     <Compile Include="Clients\ReferencesClient.cs" />
     <Compile Include="Clients\StarredClient.cs" />
+    <Compile Include="Clients\PullRequestsClient.cs" />
     <Compile Include="Clients\TagsClient.cs" />
     <Compile Include="Clients\TreesClient.cs" />
     <Compile Include="Clients\TeamsClient.cs" />
@@ -98,6 +100,10 @@
     <Compile Include="Models\Request\NewTeam.cs" />
     <Compile Include="Models\Request\Permission.cs" />
     <Compile Include="Models\Request\ReferenceUpdate.cs" />
+    <Compile Include="Models\Request\NewPullRequest.cs" />
+    <Compile Include="Models\Request\NewTag.cs" />
+    <Compile Include="Models\Request\PullRequestRequest.cs" />
+    <Compile Include="Models\Request\PullRequestUpdate.cs" />
     <Compile Include="Models\Request\RequestParameters.cs" />
     <Compile Include="Models\Request\StarredRequest.cs" />
     <Compile Include="Models\Request\UpdateTeam.cs" />
diff --git a/Octokit/Octokit-netcore45.csproj b/Octokit/Octokit-netcore45.csproj
index 68d7309f..4b21fbed 100644
--- a/Octokit/Octokit-netcore45.csproj
+++ b/Octokit/Octokit-netcore45.csproj
@@ -80,6 +80,7 @@
     <Compile Include="Clients\IOrganizationMembersClient.cs" />
     <Compile Include="Clients\IOrganizationsClient.cs" />
     <Compile Include="Clients\IReferencesClient.cs" />
+    <Compile Include="Clients\IPullRequestsClient.cs" />
     <Compile Include="Clients\IReleasesClient.cs" />
     <Compile Include="Clients\IRepositoriesClient.cs" />
     <Compile Include="Clients\ISshKeysClient.cs" />
@@ -99,6 +100,7 @@
     <Compile Include="Clients\OrganizationMembersClient.cs" />
     <Compile Include="Clients\OrganizationsClient.cs" />
     <Compile Include="Clients\ReferencesClient.cs" />
+    <Compile Include="Clients\PullRequestsClient.cs" />
     <Compile Include="Clients\ReleasesClient.cs" />
     <Compile Include="Clients\RepositoriesClient.cs" />
     <Compile Include="Clients\SshKeysClient.cs" />
@@ -173,6 +175,7 @@
     <Compile Include="Models\Request\NewLabel.cs" />
     <Compile Include="Models\Request\NewMilestone.cs" />
     <Compile Include="Models\Request\NewReference.cs" />
+    <Compile Include="Models\Request\NewPullRequest.cs" />
     <Compile Include="Models\Request\NewRepository.cs" />
     <Compile Include="Models\Request\NewSubscription.cs" />
     <Compile Include="Models\Request\NewTag.cs" />
@@ -181,6 +184,8 @@
     <Compile Include="Models\Request\NewTeam.cs" />
     <Compile Include="Models\Request\Permission.cs" />
     <Compile Include="Models\Request\ReferenceUpdate.cs" />
+    <Compile Include="Models\Request\PullRequestRequest.cs" />
+    <Compile Include="Models\Request\PullRequestUpdate.cs" />
     <Compile Include="Models\Request\ReleaseUpdate.cs" />
     <Compile Include="Models\Request\RepositoryIssueRequest.cs" />
     <Compile Include="Models\Request\RequestParameters.cs" />