diff --git a/Octokit.Tests.Integration/Clients/IssuesClientTests.cs b/Octokit.Tests.Integration/Clients/IssuesClientTests.cs
index 2a92b35b59..0edfcbdcfe 100644
--- a/Octokit.Tests.Integration/Clients/IssuesClientTests.cs
+++ b/Octokit.Tests.Integration/Clients/IssuesClientTests.cs
@@ -213,6 +213,46 @@ public async Task CanCreateRetrieveAndCloseIssue()
         }
     }
 
+    [IntegrationTest]
+    public async Task CanCreateCloseAndReopenIssue()
+    {
+        var newIssue = new NewIssue("a test issue") { Body = "A new unassigned issue" };
+        newIssue.Labels.Add("test");
+        newIssue.Assignees.Add(_context.RepositoryOwner);
+
+        var issue = await _issuesClient.Create(_context.RepositoryOwner, _context.RepositoryName, newIssue);
+        Assert.NotNull(issue);
+        Assert.True(issue.Assignees.All(x => x.Login == _context.RepositoryOwner));
+
+        var retrieved = await _issuesClient.Get(_context.RepositoryOwner, _context.RepositoryName, issue.Number);
+        Assert.NotNull(retrieved);
+        Assert.True(retrieved.Assignees.Count == 1);
+        Assert.True(retrieved.Assignees[0].Login == _context.RepositoryOwner);
+
+        var update = retrieved.ToUpdate();
+        update.State = ItemState.Closed;
+        update.StateReason = ItemStateReason.NotPlanned;
+
+        var closed = await _issuesClient.Update(_context.RepositoryOwner, _context.RepositoryName, issue.Number, update);
+        Assert.NotNull(closed);
+        Assert.Equal(ItemState.Closed, closed.State);
+        Assert.Equal(ItemStateReason.NotPlanned, closed.StateReason);
+
+        retrieved = await _issuesClient.Get(_context.RepositoryOwner, _context.RepositoryName, issue.Number);
+        Assert.NotNull(retrieved);
+        Assert.Equal(ItemState.Closed, retrieved.State);
+        Assert.Equal(ItemStateReason.NotPlanned, retrieved.StateReason);
+
+        update = retrieved.ToUpdate();
+        update.State = ItemState.Open;
+        update.StateReason = ItemStateReason.Reopened;
+
+        var reopened = await _issuesClient.Update(_context.RepositoryOwner, _context.RepositoryName, issue.Number, update);
+        Assert.NotNull(reopened);
+        Assert.Equal(ItemState.Open, reopened.State);
+        Assert.Equal(ItemStateReason.Reopened, reopened.StateReason);
+    }
+
     [IntegrationTest]
     public async Task CanCreateRetrieveAndCloseIssueWithRepositoryId()
     {
diff --git a/Octokit.Tests/Models/IssueTest.cs b/Octokit.Tests/Models/IssueTest.cs
index 7d0e910f5e..8e34033383 100644
--- a/Octokit.Tests/Models/IssueTest.cs
+++ b/Octokit.Tests/Models/IssueTest.cs
@@ -145,6 +145,7 @@ public void CreatesAnIssueUpdateRequestObject()
 ""html_url"": ""https://github.com/octocat/Hello-World/issues/1347"",
 ""number"": 1347,
 ""state"": ""open"",
+""state_reason"": ""reopened"",
 ""title"": ""Found a bug"",
 ""body"": ""I'm having a problem with this."",
 ""user"": {
@@ -283,6 +284,7 @@ public void CreatesAnIssueUpdateRequestObject()
             Assert.NotNull(update.Labels);
             Assert.Equal(1, update.Milestone.GetValueOrDefault());
             Assert.Equal("octocat", update.Assignees.FirstOrDefault());
+            Assert.Equal(ItemStateReason.Reopened, update.StateReason.GetValueOrDefault());
         }
     }
 }
diff --git a/Octokit/Models/Request/IssueRequest.cs b/Octokit/Models/Request/IssueRequest.cs
index 8c6edc9a0f..c58792e967 100644
--- a/Octokit/Models/Request/IssueRequest.cs
+++ b/Octokit/Models/Request/IssueRequest.cs
@@ -167,6 +167,30 @@ public enum ItemState
         Closed
     }
 
+    /// <summary>
+    /// The reason for the state change.
+    /// </summary>
+    public enum ItemStateReason
+    {
+      /// <summary>
+      /// Item closed as completed.
+      /// </summary>
+      [Parameter(Value = "completed")]
+      Completed,
+
+      /// <summary>
+      /// Item closed as unplanned.
+      /// </summary>
+      [Parameter(Value = "not_planned")]
+      NotPlanned,
+
+      /// <summary>
+      /// Item reopened.
+      /// </summary>
+      [Parameter(Value = "reopened")]
+      Reopened
+    }
+
     /// <summary>
     /// The available properties to sort issues by.
     /// </summary>
diff --git a/Octokit/Models/Request/IssueUpdate.cs b/Octokit/Models/Request/IssueUpdate.cs
index 8837e1e32a..34a4821244 100644
--- a/Octokit/Models/Request/IssueUpdate.cs
+++ b/Octokit/Models/Request/IssueUpdate.cs
@@ -53,6 +53,11 @@ public class IssueUpdate
         /// </summary>
         public ItemState? State { get; set; }
 
+        /// <summary>
+        /// The reason for the state change. Ignored unless <see cref="State"/> is changed.
+        /// </summary>
+        public ItemStateReason? StateReason { get; set; }
+
         internal string DebuggerDisplay
         {
             get
@@ -157,4 +162,4 @@ public void RemoveLabel(string name)
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Octokit/Models/Response/Issue.cs b/Octokit/Models/Response/Issue.cs
index ef25f3c26f..b18e99c931 100644
--- a/Octokit/Models/Response/Issue.cs
+++ b/Octokit/Models/Response/Issue.cs
@@ -12,7 +12,7 @@ public class Issue
     {
         public Issue() { }
 
-        public Issue(string url, string htmlUrl, string commentsUrl, string eventsUrl, int number, ItemState state, string title, string body, User closedBy, User user, IReadOnlyList<Label> labels, User assignee, IReadOnlyList<User> assignees, Milestone milestone, int comments, PullRequest pullRequest, DateTimeOffset? closedAt, DateTimeOffset createdAt, DateTimeOffset? updatedAt, int id, string nodeId, bool locked, Repository repository, ReactionSummary reactions, LockReason? activeLockReason)
+        public Issue(string url, string htmlUrl, string commentsUrl, string eventsUrl, int number, ItemState state, string title, string body, User closedBy, User user, IReadOnlyList<Label> labels, User assignee, IReadOnlyList<User> assignees, Milestone milestone, int comments, PullRequest pullRequest, DateTimeOffset? closedAt, DateTimeOffset createdAt, DateTimeOffset? updatedAt, int id, string nodeId, bool locked, Repository repository, ReactionSummary reactions, LockReason? activeLockReason, ItemStateReason? stateReason)
         {
             Id = id;
             NodeId = nodeId;
@@ -39,6 +39,7 @@ public Issue(string url, string htmlUrl, string commentsUrl, string eventsUrl, i
             Repository = repository;
             Reactions = reactions;
             ActiveLockReason = activeLockReason;
+            StateReason = stateReason;
         }
 
         /// <summary>
@@ -81,6 +82,11 @@ public Issue(string url, string htmlUrl, string commentsUrl, string eventsUrl, i
         /// </summary>
         public StringEnum<ItemState> State { get; private set; }
 
+        /// <summary>
+        /// The reason for the state change. Ignored unless <see cref="State"/> is changed.
+        /// </summary>
+        public StringEnum<ItemStateReason>? StateReason { get; private set; }
+
         /// <summary>
         /// Title of the issue
         /// </summary>
@@ -186,11 +192,13 @@ public IssueUpdate ToUpdate()
                 : Labels.Select(x => x.Name);
 
             ItemState state;
+            ItemStateReason stateReason;
             var issueUpdate = new IssueUpdate
             {
                 Body = Body,
                 Milestone = milestoneId,
                 State = (State.TryParse(out state) ? (ItemState?)state : null),
+                StateReason = (StateReason.HasValue && StateReason.Value.TryParse(out stateReason) ? (ItemStateReason?)stateReason : null),
                 Title = Title
             };