diff --git a/Octokit.Reactive/Clients/IObservableTreesClient.cs b/Octokit.Reactive/Clients/IObservableTreesClient.cs
new file mode 100644
index 00000000..e2c52e06
--- /dev/null
+++ b/Octokit.Reactive/Clients/IObservableTreesClient.cs
@@ -0,0 +1,32 @@
+using System;
+
+namespace Octokit.Reactive
+{
+    public interface IObservableTreesClient
+    {
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#get-a-tree
+        /// </remarks>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Get")]
+        IObservable<TreeResponse> Get(string owner, string name, string reference);
+
+        /// <summary>
+        /// Creates a new Tree in the specified repo
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#create-a-tree
+        /// </remarks>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <param name="newTree">The value of the new tree</param>
+        /// <returns>The <see cref="TreeResponse"/> that was just created.</returns>
+        IObservable<TreeResponse> Create(string owner, string name, NewTree newTree);
+    }
+}
\ No newline at end of file
diff --git a/Octokit.Reactive/Clients/ObservableTreesClient.cs b/Octokit.Reactive/Clients/ObservableTreesClient.cs
index 35c78479..2e3ba031 100644
--- a/Octokit.Reactive/Clients/ObservableTreesClient.cs
+++ b/Octokit.Reactive/Clients/ObservableTreesClient.cs
@@ -3,9 +3,6 @@ using System.Reactive.Threading.Tasks;
 
 namespace Octokit.Reactive
 {
-    public interface IObservableTreesClient
-    {
-    }
 
     public class ObservableTreesClient : IObservableTreesClient
     {
diff --git a/Octokit.Reactive/Octokit.Reactive.csproj b/Octokit.Reactive/Octokit.Reactive.csproj
index be0f28b8..1c5ba26b 100644
--- a/Octokit.Reactive/Octokit.Reactive.csproj
+++ b/Octokit.Reactive/Octokit.Reactive.csproj
@@ -74,6 +74,7 @@
       <Link>Properties\SolutionInfo.cs</Link>
     </Compile>
     <Compile Include="Clients\IObservableEventsClient.cs" />
+    <Compile Include="Clients\IObservableTreesClient.cs" />
     <Compile Include="Clients\ObservableEventsClient.cs" />
     <Compile Include="Clients\ObservableGitDatabaseClient.cs" />
     <Compile Include="Clients\IObservableGitDatabaseClient.cs" />
diff --git a/Octokit.Tests/Octokit.Tests.csproj b/Octokit.Tests/Octokit.Tests.csproj
index 4070d36a..75bce2af 100644
--- a/Octokit.Tests/Octokit.Tests.csproj
+++ b/Octokit.Tests/Octokit.Tests.csproj
@@ -118,6 +118,7 @@
     <Compile Include="Reactive\ObservableIssuesClientTests.cs" />
     <Compile Include="Reactive\ObservableMilestonesClientTests.cs" />
     <Compile Include="Reactive\ObservableRepositoriesClientTests.cs" />
+    <Compile Include="Reactive\ObservableTreesClientTests.cs" />
     <Compile Include="SimpleJsonSerializerTests.cs" />
     <Compile Include="Clients\UsersClientTests.cs" />
   </ItemGroup>
diff --git a/Octokit.Tests/Reactive/ObservableTreesClientTests.cs b/Octokit.Tests/Reactive/ObservableTreesClientTests.cs
new file mode 100644
index 00000000..b69f776e
--- /dev/null
+++ b/Octokit.Tests/Reactive/ObservableTreesClientTests.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Reactive.Linq;
+using System.Threading.Tasks;
+using NSubstitute;
+using Octokit.Reactive;
+using Octokit.Tests.Helpers;
+using Xunit;
+
+namespace Octokit.Tests
+{
+    public class ObservableTreesClientTests
+    {
+        public class TheGetMethod
+        {
+            [Fact]
+            public void GetsFromClientIssueIssue()
+            {
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservableTreesClient(gitHubClient);
+
+                client.Get("fake", "repo", "123456ABCD");
+
+                gitHubClient.Tree.Received().Get("fake", "repo", "123456ABCD");
+            }
+
+            [Fact]
+            public async Task EnsuresNonNullArguments()
+            {
+                var client = new ObservableTreesClient(Substitute.For<IGitHubClient>());
+
+                await AssertEx.Throws<ArgumentNullException>(async () => await client.Get(null, "name", "123456ABCD"));
+                await AssertEx.Throws<ArgumentException>(async () => await client.Get("", "name", "123456ABCD"));
+                await AssertEx.Throws<ArgumentNullException>(async () => await client.Get("owner", null, "123456ABCD"));
+                await AssertEx.Throws<ArgumentException>(async () => await client.Get("owner", "", "123456ABCD"));
+                await AssertEx.Throws<ArgumentNullException>(async () => await client.Get("owner", "name", null));
+                await AssertEx.Throws<ArgumentException>(async () => await client.Get("owner", "name", ""));
+            }
+        }
+        
+        public class TheCreateMethod
+        {
+            [Fact]
+            public void CreatesFromClientIssueIssue()
+            {
+                var newTree = new NewTree();
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservableTreesClient(gitHubClient);
+
+                client.Create("fake", "repo", newTree);
+
+                gitHubClient.Tree.Received().Create("fake", "repo", newTree);
+            }
+
+            [Fact]
+            public async Task EnsuresArgumentsNotNull()
+            {
+                var gitHubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservableTreesClient(gitHubClient);
+
+                AssertEx.Throws<ArgumentNullException>(async () => await client.Create(null, "name", new NewTree()));
+                AssertEx.Throws<ArgumentException>(async () => await client.Create("", "name", new NewTree()));
+                AssertEx.Throws<ArgumentNullException>(async () => await client.Create("owner", null, new NewTree()));
+                AssertEx.Throws<ArgumentException>(async () => await client.Create("owner", "", new NewTree()));
+                AssertEx.Throws<ArgumentNullException>(async () => await client.Create("owner", "name", null));
+            }
+        }
+    }
+}