diff --git a/Octokit.Tests/Helpers/StringExtensionsTests.cs b/Octokit.Tests/Helpers/StringExtensionsTests.cs
index 8a3fc36f..c90d9468 100644
--- a/Octokit.Tests/Helpers/StringExtensionsTests.cs
+++ b/Octokit.Tests/Helpers/StringExtensionsTests.cs
@@ -64,5 +64,30 @@ namespace Octokit.Tests.Helpers
                 Assert.Equal(expected, template.ExpandUriTemplate(new { name = "example name.txt", label = "labeltext" }).ToString());
             }
         }
+
+        public class EscapeDoubleQuotesMethod
+        {
+            [Fact]
+            public void EscapeDoubleQuotesReturnsNullForNullInput()
+            {
+                Assert.Equal(null, (null as string).EscapeDoubleQuotes());
+            }
+
+            [Fact]
+            public void EscapeDoubleQuotesReturnsInputWithoutDoubleQuotes()
+            {
+                string input = "some test input without double quotes in it";
+
+                Assert.Equal(input, input.EscapeDoubleQuotes());
+            }
+
+            [Fact]
+            public void EscapeDoubleQuotesEscapesAllDoubleQuotes()
+            {
+                string input = "\"test milestone\"";
+
+                Assert.Equal("\\\"test milestone\\\"", input.EscapeDoubleQuotes());
+            }
+        }
     }
 }
diff --git a/Octokit.Tests/Models/SearchIssuesRequestExclusionsTests.cs b/Octokit.Tests/Models/SearchIssuesRequestExclusionsTests.cs
index 7b6d9815..2b31db6f 100644
--- a/Octokit.Tests/Models/SearchIssuesRequestExclusionsTests.cs
+++ b/Octokit.Tests/Models/SearchIssuesRequestExclusionsTests.cs
@@ -19,7 +19,8 @@ public class SearchIssuesRequestExclusionsTests
                 { "commenter:", (x,value) => x.Commenter = value },
                 { "involves:", (x,value) => x.Involves = value },
                 { "head:", (x,value) => x.Head = value },
-                { "base:", (x,value) => x.Base = value }
+                { "base:", (x,value) => x.Base = value },
+                { "milestone:", (x,value) => x.Milestone = value }
             };
 
             foreach (var property in stringProperties)
@@ -80,5 +81,25 @@ public class SearchIssuesRequestExclusionsTests
 
             Assert.True(request.MergedQualifiers().Contains("-status:error"));
         }
+
+        [Fact]
+        public void HandlesMilestoneAttributeWithoutQuotes()
+        {
+            var request = new SearchIssuesRequestExclusions();
+            Assert.False(request.MergedQualifiers().Any(x => x.Contains("-milestone:")));
+
+            request.Milestone = "testMilestone";
+            Assert.True(request.MergedQualifiers().Contains("-milestone:\"testMilestone\""));
+        }
+
+        [Fact]
+        public void DoesntWrapMilestoneWithDoubleQuotesForQuotedMilestone()
+        {
+            var request = new SearchIssuesRequestExclusions();
+            Assert.False(request.MergedQualifiers().Any(x => x.Contains("-milestone:")));
+
+            request.Milestone = "\"testMilestone\"";
+            Assert.Contains<string>("-milestone:\"\\\"testMilestone\\\"\"", request.MergedQualifiers());
+        }
     }
 }
\ No newline at end of file
diff --git a/Octokit.Tests/Models/SearchIssuesRequestTests.cs b/Octokit.Tests/Models/SearchIssuesRequestTests.cs
index 889081d2..13bcbb32 100644
--- a/Octokit.Tests/Models/SearchIssuesRequestTests.cs
+++ b/Octokit.Tests/Models/SearchIssuesRequestTests.cs
@@ -41,7 +41,8 @@ public class SearchIssuesRequestTests
                 { "team:", (x,value) => x.Team = value },
                 { "head:", (x,value) => x.Head = value },
                 { "base:", (x,value) => x.Base = value },
-                { "user:", (x,value) => x.User = value }
+                { "user:", (x,value) => x.User = value },
+                { "milestone:", (x,value) => x.Milestone = value }
             };
 
             foreach (var property in stringProperties)
@@ -116,6 +117,26 @@ public class SearchIssuesRequestTests
             Assert.True(request.MergedQualifiers().Contains("label:label2"));
         }
 
+        [Fact]
+        public void HandlesMilestoneAttributeWithoutQuotes()
+        {
+            var request = new SearchIssuesRequest("text");
+            Assert.False(request.MergedQualifiers().Any(x => x.Contains("milestone:")));
+
+            request.Milestone = "testMilestone";
+            Assert.True(request.MergedQualifiers().Contains("milestone:\"testMilestone\""));
+        }
+
+        [Fact]
+        public void DoesntWrapMilestoneWithDoubleQuotesForQuotedMilestone()
+        {
+            var request = new SearchIssuesRequest("text");
+            Assert.False(request.MergedQualifiers().Any(x => x.Contains("milestone:")));
+
+            request.Milestone = "\"testMilestone\"";
+            Assert.Contains<string>("milestone:\"\\\"testMilestone\\\"\"", request.MergedQualifiers());
+        }
+
         [Fact]
         public void HandlesNoMetadataAttributeCorrectly()
         {
diff --git a/Octokit/Helpers/StringExtensions.cs b/Octokit/Helpers/StringExtensions.cs
index a1cd0580..30526f83 100644
--- a/Octokit/Helpers/StringExtensions.cs
+++ b/Octokit/Helpers/StringExtensions.cs
@@ -87,6 +87,17 @@ namespace Octokit
             Ensure.ArgumentNotNullOrEmptyString(value, nameof(value));
             return string.Concat(value[0].ToString().ToUpperInvariant(), value.Substring(1));
         }
+
+        internal static string EscapeDoubleQuotes(this string value)
+        {
+            if (value != null)
+            {
+                return value.Replace("\"", "\\\"");
+            }
+
+            return value;
+        }
+
         static IEnumerable<string> SplitUpperCase(this string source)
         {
             Ensure.ArgumentNotNullOrEmptyString(source, nameof(source));
diff --git a/Octokit/Models/Request/SearchIssuesRequest.cs b/Octokit/Models/Request/SearchIssuesRequest.cs
index 299111b1..f0c66287 100644
--- a/Octokit/Models/Request/SearchIssuesRequest.cs
+++ b/Octokit/Models/Request/SearchIssuesRequest.cs
@@ -1,11 +1,11 @@
-using System;
+using Octokit.Internal;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Linq;
-using Octokit.Internal;
 
 namespace Octokit
 {
@@ -168,6 +168,7 @@ namespace Octokit
         public Language? Language { get; set; }
 
         private IEnumerable<IssueIsQualifier> _is;
+
         /// <summary>
         /// Searches for issues using a more human syntax covering options like state, type, merged status, private/public repository
         /// </summary>
@@ -258,6 +259,11 @@ namespace Octokit
         /// </remarks>
         public string User { get; set; }
 
+        /// <summary>
+        /// Gets or sets the milestone to filter issues based on
+        /// </summary>
+        public string Milestone { get; set; }
+
         [SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
         public RepositoryCollection Repos { get; set; }
 
@@ -391,6 +397,11 @@ namespace Octokit
                 parameters.AddRange(Repos.Select(x => string.Format(CultureInfo.InvariantCulture, "repo:{0}", x)));
             }
 
+            if (Milestone.IsNotBlank())
+            {
+                parameters.Add(string.Format(CultureInfo.InvariantCulture, "milestone:\"{0}\"", Milestone.EscapeDoubleQuotes()));
+            }
+
             // Add any exclusion parameters
             if (Exclusions != null)
             {
diff --git a/Octokit/Models/Request/SearchIssuesRequestExclusions.cs b/Octokit/Models/Request/SearchIssuesRequestExclusions.cs
index 9b0ecc6b..38815a2a 100644
--- a/Octokit/Models/Request/SearchIssuesRequestExclusions.cs
+++ b/Octokit/Models/Request/SearchIssuesRequestExclusions.cs
@@ -1,11 +1,9 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Linq;
-using Octokit.Internal;
 
 namespace Octokit
 {
@@ -122,6 +120,14 @@ namespace Octokit
         /// </remarks>
         public string Base { get; set; }
 
+        /// <summary>
+        /// Excludes issues which target the specified milestone.
+        /// </summary>
+        /// <remarks>
+        /// https://help.github.com/articles/searching-issues-and-pull-requests/#search-by-milestone-on-an-issue-or-pull-request
+        /// </remarks>
+        public string Milestone { get; set; }
+
         [SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")]
         public IReadOnlyList<string> MergedQualifiers()
         {
@@ -182,6 +188,11 @@ namespace Octokit
                 parameters.Add(string.Format(CultureInfo.InvariantCulture, "-base:{0}", Base));
             }
 
+            if (Milestone.IsNotBlank())
+            {
+                parameters.Add(string.Format(CultureInfo.InvariantCulture, "-milestone:\"{0}\"", Milestone.EscapeDoubleQuotes()));
+            }
+
             return new ReadOnlyCollection<string>(parameters);
         }