diff --git a/src/main/scala/gitbucket/core/service/IssuesService.scala b/src/main/scala/gitbucket/core/service/IssuesService.scala
index 6e9463b..fb2088d 100644
--- a/src/main/scala/gitbucket/core/service/IssuesService.scala
+++ b/src/main/scala/gitbucket/core/service/IssuesService.scala
@@ -778,16 +778,37 @@
   def createReferComment(owner: String, repository: String, fromIssue: Issue, message: String, loginAccount: Account)(
     implicit s: Session
   ): Unit = {
-    extractIssueId(message).foreach { issueId =>
-      val content = s"${fromIssue.issueId}:${fromIssue.title}"
-      if (getIssue(owner, repository, issueId).isDefined) {
-        // Not add if refer comment already exist.
-        if (!getComments(owner, repository, issueId.toInt).exists { x =>
-              x.action == "refer" && x.content == content
-            }) {
-          createComment(owner, repository, loginAccount.userName, issueId.toInt, content, "refer")
+    extractGlobalIssueId(message).foreach {
+      case (_referredOwner, _referredRepository, referredIssueId) =>
+        val referredOwner = _referredOwner.getOrElse(owner)
+        val referredRepository = _referredRepository.getOrElse(repository)
+        getRepository(referredOwner, referredRepository).foreach { repo =>
+          if (isReadable(repo.repository, Option(loginAccount))) {
+            getIssue(referredOwner, referredRepository, referredIssueId.get).foreach { _ =>
+              val (content, action) = if (owner == referredOwner && repository == referredRepository) {
+                (s"${fromIssue.issueId}:${fromIssue.title}", "refer")
+              } else {
+                (s"${fromIssue.issueId}:${owner}:${repository}:${fromIssue.title}", "refer_global")
+              }
+              referredIssueId.foreach(
+                x =>
+                  // Not add if refer comment already exist.
+                  if (!getComments(referredOwner, referredRepository, x.toInt).exists { x =>
+                        (x.action == "refer" || x.action == "refer_global") && x.content == content
+                      }) {
+                    createComment(
+                      referredOwner,
+                      referredRepository,
+                      loginAccount.userName,
+                      x.toInt,
+                      content,
+                      action
+                    )
+                }
+              )
+            }
+          }
         }
-      }
     }
   }
 
diff --git a/src/main/scala/gitbucket/core/util/StringUtil.scala b/src/main/scala/gitbucket/core/util/StringUtil.scala
index 1b57384..7da4a87 100644
--- a/src/main/scala/gitbucket/core/util/StringUtil.scala
+++ b/src/main/scala/gitbucket/core/util/StringUtil.scala
@@ -12,6 +12,7 @@
 import org.apache.commons.io.IOUtils
 
 import scala.util.control.Exception._
+import scala.util.matching.Regex.Match.unapply
 
 object StringUtil {
 
@@ -145,6 +146,19 @@
       .distinct
 
   /**
+   * Extract issue id like ```owner/repository#issueId``` from the given message.
+   *
+   *@param message the message which may contains issue id
+   * @return the iterator of issue id
+   */
+  def extractGlobalIssueId(message: String): List[(Option[String], Option[String], Option[String])] =
+    "\\s?([\\w-\\.]+)?\\/?([\\w\\-\\.]+)?#(\\d+)\\s?".r
+      .findAllIn(message)
+      .matchData
+      .map(i => (Option(i.group(1)), Option(i.group(2)), Option(i.group(3))))
+      .toList
+
+  /**
    * Extract close issue id like ```close #issueId ``` from the given message.
    *
    * @param message the message which may contains close command
diff --git a/src/main/scala/gitbucket/core/view/LinkConverter.scala b/src/main/scala/gitbucket/core/view/LinkConverter.scala
index 34f5019..d1b26b2 100644
--- a/src/main/scala/gitbucket/core/view/LinkConverter.scala
+++ b/src/main/scala/gitbucket/core/view/LinkConverter.scala
@@ -10,15 +10,12 @@
   /**
    * Creates a link to the issue or the pull request from the issue id.
    */
-  protected def createIssueLink(repository: RepositoryService.RepositoryInfo, issueId: Int, title: String)(
+  protected def createIssueLink(owner: String, repository: String, issueId: Int, title: String)(
     implicit context: Context
   ): String = {
-    val userName = repository.repository.userName
-    val repositoryName = repository.repository.repositoryName
-
-    getIssueFromCache(userName, repositoryName, issueId.toString) match {
+    getIssueFromCache(owner, repository, issueId.toString) match {
       case Some(issue) =>
-        s"""<a href="${context.path}/${userName}/${repositoryName}/${if (issue.isPullRequest) "pull" else "issues"}/${issueId}"><strong>${StringUtil
+        s"""<a href="${context.path}/${owner}/${repository}/${if (issue.isPullRequest) "pull" else "issues"}/${issueId}"><strong>${StringUtil
           .escapeHtml(title)}</strong> #${issueId}</a>"""
       case None =>
         s"Unknown #${issueId}"
@@ -26,6 +23,21 @@
   }
 
   /**
+   * Creates a global link to the issue or the pull request from the issue id.
+   */
+  protected def createGlobalIssueLink(owner: String, repository: String, issueId: Int, title: String)(
+    implicit context: Context
+  ): String = {
+    getIssueFromCache(owner, repository, issueId.toString) match {
+      case Some(issue) =>
+        s"""<a href="${context.path}/${owner}/${repository}/${if (issue.isPullRequest) "pull" else "issues"}/${issueId}"><strong>${StringUtil
+          .escapeHtml(title)}</strong> ${owner}/${repository}#${issueId}</a>"""
+      case None =>
+        s"Unknown ${owner}/${repository}#${issueId}"
+    }
+  }
+
+  /**
    * Converts issue id, username and commit id to link in the given text.
    */
   protected def convertRefsLinks(
diff --git a/src/main/scala/gitbucket/core/view/helpers.scala b/src/main/scala/gitbucket/core/view/helpers.scala
index 3b72130..ebfefeb 100644
--- a/src/main/scala/gitbucket/core/view/helpers.scala
+++ b/src/main/scala/gitbucket/core/view/helpers.scala
@@ -160,10 +160,19 @@
   /**
    * Creates a link to the issue or the pull request from the issue id.
    */
-  def issueLink(repository: RepositoryService.RepositoryInfo, issueId: Int, title: String)(
+  def issueLink(owner: String, repository: String, issueId: Int, title: String)(
     implicit context: Context
   ): Html = {
-    Html(createIssueLink(repository, issueId, title))
+    Html(createIssueLink(owner, repository, issueId, title))
+  }
+
+  /**
+   * Creates a global link to the issue or the pull request from the issue id.
+   */
+  def issueGlobalLink(owner: String, repository: String, issueId: Int, title: String)(
+    implicit context: Context
+  ): Html = {
+    Html(createGlobalIssueLink(owner, repository, issueId, title))
   }
 
   /**
diff --git a/src/main/twirl/gitbucket/core/issues/commentlist.scala.html b/src/main/twirl/gitbucket/core/issues/commentlist.scala.html
index 75b178f..fa1dd84 100644
--- a/src/main/twirl/gitbucket/core/issues/commentlist.scala.html
+++ b/src/main/twirl/gitbucket/core/issues/commentlist.scala.html
@@ -114,9 +114,26 @@
             @gitbucket.core.helper.html.datetimeago(comment.registeredDate)
           </div>
           <div style="discussion-item-content">
-            @defining(comment.content.split(":")){ case Array(issueId, rest @ _*) => {
-              @helpers.issueLink(repository, issueId.toInt, rest.mkString(":"))
-            }}
+            @defining(comment.content.split(":")){
+              case Array(issueId, rest @ _*) => {@helpers.issueLink(repository.owner, repository.name, issueId.toInt, rest.mkString(":"))}
+            }
+          </div>
+        </div>
+      }
+      case "refer_global" => {
+        <div class="discussion-item discussion-item-refer">
+          <div class="discussion-item-header">
+            <span class="discussion-item-icon"><i class="octicon octicon-bookmark"></i></span>
+            @helpers.avatarLink(comment.commentedUserName, 16)
+            @helpers.user(comment.commentedUserName, styleClass="username strong")
+            referenced the @issueOrPullRequest()
+            @gitbucket.core.helper.html.datetimeago(comment.registeredDate)
+          </div>
+          <div style="discussion-item-content">
+          @defining(comment.content.split(":")){
+            case Array(issueId, ownerName, repositoryName, rest @ _*) => {
+              @helpers.issueGlobalLink(ownerName, repositoryName, issueId.toInt, rest.mkString(":"))
+          }}
           </div>
         </div>
       }
diff --git a/src/test/scala/gitbucket/core/util/StringUtilSpec.scala b/src/test/scala/gitbucket/core/util/StringUtilSpec.scala
index 3c4016b..7884358 100644
--- a/src/test/scala/gitbucket/core/util/StringUtilSpec.scala
+++ b/src/test/scala/gitbucket/core/util/StringUtilSpec.scala
@@ -57,6 +57,20 @@
     }
   }
 
+  describe("extractGlobalIssueId") {
+    it("should extract '#xxx' and return extracted id") {
+      assert(StringUtil.extractGlobalIssueId("(refs #123)").toSeq == List((None, None, Some("123"))))
+    }
+    it("should extract 'owner/repository#xxx' and return extracted owner, repository and id") {
+      assert(
+        StringUtil.extractGlobalIssueId("(refs root/test#123)").toSeq == List((Some("root"), Some("test"), Some("123")))
+      )
+    }
+    it("should return Nil from message which does not contain #xxx") {
+      assert(StringUtil.extractGlobalIssueId("this is test!").toSeq == Nil)
+    }
+  }
+
   describe("extractCloseId") {
     it("should extract 'close #xxx' and return extracted id") {
       assert(StringUtil.extractCloseId("(close #123)").toSeq == Seq("123"))