diff --git a/src/main/scala/gitbucket/core/controller/ApiController.scala b/src/main/scala/gitbucket/core/controller/ApiController.scala
index 049f59b..9f4dd89 100644
--- a/src/main/scala/gitbucket/core/controller/ApiController.scala
+++ b/src/main/scala/gitbucket/core/controller/ApiController.scala
@@ -1,7 +1,12 @@
 package gitbucket.core.controller
 
 import gitbucket.core.api._
-import gitbucket.core.controller.api.{ApiOrganizationControllerBase, ApiRepositoryControllerBase, ApiUserControllerBase}
+import gitbucket.core.controller.api.{
+  ApiIssueLabelControllerBase,
+  ApiOrganizationControllerBase,
+  ApiRepositoryControllerBase,
+  ApiUserControllerBase
+}
 import gitbucket.core.service._
 import gitbucket.core.util.Implicits._
 import gitbucket.core.util._
@@ -12,6 +17,7 @@
     with ApiOrganizationControllerBase
     with ApiRepositoryControllerBase
     with ApiUserControllerBase
+    with ApiIssueLabelControllerBase
     with RepositoryService
     with AccountService
     with ProtectedBranchService
@@ -30,6 +36,7 @@
     with WikiService
     with ActivityService
     with PrioritiesService
+    with AdminAuthenticator
     with OwnerAuthenticator
     with UsersAuthenticator
     with GroupManagerAuthenticator
diff --git a/src/main/scala/gitbucket/core/controller/api/ApiIssueLabelControllerBase.scala b/src/main/scala/gitbucket/core/controller/api/ApiIssueLabelControllerBase.scala
index 0f9e4cc..307a4db 100644
--- a/src/main/scala/gitbucket/core/controller/api/ApiIssueLabelControllerBase.scala
+++ b/src/main/scala/gitbucket/core/controller/api/ApiIssueLabelControllerBase.scala
@@ -109,26 +109,84 @@
    * vi. List labels on an issue
    * https://developer.github.com/v3/issues/labels/#list-labels-on-an-issue
    */
+  get("/api/v3/repos/:owner/:repository/issues/:id/labels")(referrersOnly { repository =>
+    JsonFormat(getIssueLabels(repository.owner, repository.name, params("id").toInt).map { l =>
+      ApiLabel(l, RepositoryName(repository.owner, repository.name))
+    })
+  })
 
   /*
    * vii. Add labels to an issue
    * https://developer.github.com/v3/issues/labels/#add-labels-to-an-issue
    */
+  post("/api/v3/repos/:owner/:repository/issues/:id/labels")(writableUsersOnly { repository =>
+    JsonFormat(for {
+      data <- extractFromJsonBody[Seq[String]];
+      issueId <- params("id").toIntOpt
+    } yield {
+      data.map { labelName =>
+        val label = getLabel(repository.owner, repository.name, labelName).getOrElse(
+          getLabel(
+            repository.owner,
+            repository.name,
+            createLabel(repository.owner, repository.name, labelName)
+          ).get
+        )
+        registerIssueLabel(repository.owner, repository.name, issueId, label.labelId, true)
+        ApiLabel(label, RepositoryName(repository.owner, repository.name))
+      }
+    })
+  })
 
   /*
    * viii. Remove a label from an issue
    * https://developer.github.com/v3/issues/labels/#remove-a-label-from-an-issue
    */
+  delete("/api/v3/repos/:owner/:repository/issues/:id/labels/:name")(writableUsersOnly { repository =>
+    val issueId = params("id").toInt
+    val labelName = params("name")
+    getLabel(repository.owner, repository.name, labelName) match {
+      case Some(label) =>
+        deleteIssueLabel(repository.owner, repository.name, issueId, label.labelId, true)
+        JsonFormat(Seq(label))
+      case None =>
+        NotFound()
+    }
+  })
 
   /*
    * ix. Replace all labels for an issue
    * https://developer.github.com/v3/issues/labels/#replace-all-labels-for-an-issue
    */
+  put("/api/v3/repos/:owner/:repository/issues/:id/labels")(writableUsersOnly { repository =>
+    JsonFormat(for {
+      data <- extractFromJsonBody[Seq[String]];
+      issueId <- params("id").toIntOpt
+    } yield {
+      deleteAllIssueLabels(repository.owner, repository.name, issueId, true)
+      data.map { labelName =>
+        val label = getLabel(repository.owner, repository.name, labelName).getOrElse(
+          getLabel(
+            repository.owner,
+            repository.name,
+            createLabel(repository.owner, repository.name, labelName)
+          ).get
+        )
+        registerIssueLabel(repository.owner, repository.name, issueId, label.labelId, true)
+        ApiLabel(label, RepositoryName(repository.owner, repository.name))
+      }
+    })
+  })
 
   /*
    * x. Remove all labels from an issue
    * https://developer.github.com/v3/issues/labels/#remove-all-labels-from-an-issue
    */
+  delete("/api/v3/repos/:owner/:repository/issues/:id/labels")(writableUsersOnly { repository =>
+    val issueId = params("id").toInt
+    deleteAllIssueLabels(repository.owner, repository.name, issueId, true)
+    NoContent()
+  })
 
   /*
  * xi Get labels for every issue in a milestone
diff --git a/src/main/scala/gitbucket/core/controller/api/ApiUserControllerBase.scala b/src/main/scala/gitbucket/core/controller/api/ApiUserControllerBase.scala
index d5bbbd8..dc708d9 100644
--- a/src/main/scala/gitbucket/core/controller/api/ApiUserControllerBase.scala
+++ b/src/main/scala/gitbucket/core/controller/api/ApiUserControllerBase.scala
@@ -70,7 +70,7 @@
    * https://developer.github.com/enterprise/2.14/v3/enterprise-admin/users/#suspend-a-user
    */
   /*
-   * ghe: vii. Unsuspend a user
-   * https://developer.github.com/enterprise/2.14/v3/enterprise-admin/users/#unsuspend-a-user
-   */
+ * ghe: vii. Unsuspend a user
+ * https://developer.github.com/enterprise/2.14/v3/enterprise-admin/users/#unsuspend-a-user
+ */
 }
diff --git a/src/main/scala/gitbucket/core/service/IssuesService.scala b/src/main/scala/gitbucket/core/service/IssuesService.scala
index 86103d2..79223bf 100644
--- a/src/main/scala/gitbucket/core/service/IssuesService.scala
+++ b/src/main/scala/gitbucket/core/service/IssuesService.scala
@@ -475,6 +475,25 @@
     IssueLabels filter (_.byPrimaryKey(owner, repository, issueId, labelId)) delete
   }
 
+  def deleteAllIssueLabels(owner: String, repository: String, issueId: Int, insertComment: Boolean = false)(
+    implicit context: Context,
+    s: Session
+  ): Int = {
+    if (insertComment) {
+      IssueComments insert IssueComment(
+        userName = owner,
+        repositoryName = repository,
+        issueId = issueId,
+        action = "delete_label",
+        commentedUserName = context.loginAccount.map(_.userName).getOrElse("Unknown user"),
+        content = "All labels",
+        registeredDate = currentDate,
+        updatedDate = currentDate
+      )
+    }
+    IssueLabels filter (_.byIssue(owner, repository, issueId)) delete
+  }
+
   def createComment(
     owner: String,
     repository: String,
diff --git a/src/main/scala/gitbucket/core/service/LabelsService.scala b/src/main/scala/gitbucket/core/service/LabelsService.scala
index 4bbd5d8..a0f7dc8 100644
--- a/src/main/scala/gitbucket/core/service/LabelsService.scala
+++ b/src/main/scala/gitbucket/core/service/LabelsService.scala
@@ -3,6 +3,7 @@
 import gitbucket.core.model.Label
 import gitbucket.core.model.Profile._
 import gitbucket.core.model.Profile.profile.blockingApi._
+import gitbucket.core.util.StringUtil
 
 trait LabelsService {
 
@@ -24,6 +25,11 @@
     )
   }
 
+  def createLabel(owner: String, repository: String, labelName: String)(implicit s: Session): Int = {
+    val color = StringUtil.md5(labelName).substring(0, 6)
+    createLabel(owner, repository, labelName, color)
+  }
+
   def updateLabel(owner: String, repository: String, labelId: Int, labelName: String, color: String)(
     implicit s: Session
   ): Unit =