diff --git a/src/General/Index.coffee b/src/General/Index.coffee
index 910959084..82c444fe9 100644
--- a/src/General/Index.coffee
+++ b/src/General/Index.coffee
@@ -713,6 +713,7 @@ Index =
           thread = new Thread ID, g.BOARD
           newThreads.push thread
         thread.json = threadData
+        thread.lastPost = if threadData.last_replies then threadData.last_replies[threadData.last_replies.length - 1].no else ID
         threads.push thread
 
         if ((OP = thread.OP) and not OP.isFetchedQuote)
diff --git a/src/Monitoring/ThreadWatcher.coffee b/src/Monitoring/ThreadWatcher.coffee
index 10a407c4a..87feb0800 100644
--- a/src/Monitoring/ThreadWatcher.coffee
+++ b/src/Monitoring/ThreadWatcher.coffee
@@ -16,7 +16,7 @@ ThreadWatcher =
     @list   = @dialog.lastElementChild
     @refreshButton = $ '.refresh', @dialog
     @closeButton = $('.move > .close', @dialog)
-    @unreaddb = Unread.db or new DataBoard 'lastReadPosts'
+    @unreaddb = Unread.db or UnreadIndex.db or new DataBoard 'lastReadPosts'
     @unreadEnabled = Conf['Remember Last Read Post'] and Site.software is 'yotsuba'
 
     $.on d, 'QRPostSuccessful',   @cb.post
diff --git a/src/Monitoring/UnreadIndex.coffee b/src/Monitoring/UnreadIndex.coffee
new file mode 100644
index 000000000..2f77921b3
--- /dev/null
+++ b/src/Monitoring/UnreadIndex.coffee
@@ -0,0 +1,69 @@
+UnreadIndex =
+  hasUnread: {}
+  markReadLink: {}
+
+  init: ->
+    return unless g.VIEW is 'index' and Conf['Remember Last Read Post'] and Conf['Mark Read from Index']
+
+    @db = new DataBoard 'lastReadPosts', @sync
+
+    if Index.enabled
+      $.on d, 'IndexRefreshInternal',
+        @onIndexRefresh
+    else
+      Callbacks.Thread.push
+        name: 'Mark Read from Index'
+        cb:   @node
+
+    Callbacks.Post.push
+      name: 'Mark Read from Index'
+      cb:   @addPost
+
+  onIndexRefresh: ->
+    g.threads.forEach (thread) ->
+      UnreadIndex.addMarkReadLink thread
+      UnreadIndex.update thread
+
+  node: ->
+    UnreadIndex.addMarkReadLink @
+    UnreadIndex.update @
+
+  addPost: ->
+    if @ID is @thread.lastPost
+      UnreadIndex.update @thread
+
+  sync: ->
+    g.threads.forEach UnreadIndex.update
+
+  addMarkReadLink: (thread) ->
+    return unless thread.nodes.root
+    link = UnreadIndex.markReadLink[thread.fullID]
+    unless link
+      link = UnreadIndex.markReadLink[thread.fullID] = $.el 'a',
+        className: 'unread-mark-read brackets-wrap'
+        href: 'javascript:;'
+        textContent: 'Mark Read'
+      $.on link, 'click', UnreadIndex.markRead
+    if link.parentNode isnt thread.nodes.root
+      $.add thread.nodes.root, link
+
+  update: (thread) ->
+    return unless thread.nodes.root
+    lastReadPost = UnreadIndex.db.get(
+      boardID: thread.board.ID
+      threadID: thread.ID
+    ) or 0
+    hasUnread = (lastReadPost < thread.lastPost)
+    if hasUnread isnt UnreadIndex.hasUnread[thread.fullID]
+      thread.nodes.root.classList.toggle 'unread-thread', hasUnread
+
+  markRead: ->
+    thread = Get.threadFromNode @
+    UnreadIndex.db.set
+      boardID:  thread.board.ID
+      threadID: thread.ID
+      val:      thread.lastPost
+    UnreadIndex.update thread
+    ThreadWatcher.update thread.board.ID, thread.ID,
+      unread: 0
+      quotingYou: false
diff --git a/src/classes/Post.coffee b/src/classes/Post.coffee
index 74fbe703f..3bfa57212 100644
--- a/src/classes/Post.coffee
+++ b/src/classes/Post.coffee
@@ -61,6 +61,7 @@ class Post
 
     @board.posts.push  @ID, @
     @thread.posts.push @ID, @
+    @thread.lastPost = @ID if @ID > @thread.lastPost
     g.posts.push   @fullID, @
 
   parseNodes: (root) ->
diff --git a/src/classes/Thread.coffee b/src/classes/Thread.coffee
index d5e05d691..941dce8ae 100644
--- a/src/classes/Thread.coffee
+++ b/src/classes/Thread.coffee
@@ -13,12 +13,14 @@ class Thread
     @fileLimit  = false
     @ipCount    = undefined
     @json       = null
+    @lastPost   = 0
 
     @OP = null
     @catalogView = null
 
     @nodes =
-      root: null
+      root:    null
+      summary: null
 
     @board.threads.push @ID, @
     g.threads.push  @fullID, @
diff --git a/src/config/Config.coffee b/src/config/Config.coffee
index 83da402ed..0178367fa 100644
--- a/src/config/Config.coffee
+++ b/src/config/Config.coffee
@@ -383,6 +383,11 @@ Config =
         'Scroll back to the last read post when reopening a thread.'
         1
       ]
+      'Mark Read from Index': [
+        false
+        'Add links in the index for marking threads read.'
+        1
+      ]
       'Remove Thread Excerpt': [
         false
         'Replace the excerpt of the thread in the tab title with the board title.'
diff --git a/src/css/style.css b/src/css/style.css
index 564811ccc..cfef612fd 100644
--- a/src/css/style.css
+++ b/src/css/style.css
@@ -1063,6 +1063,18 @@ span.hide-announcement {
   margin: 0;
   border-color: rgb(255,0,0);
 }
+.unread-mark-read {
+  float: right;
+  clear: both;
+  height: 0;
+  width: 100%;
+  position: relative;
+  top: -1em;
+  text-align: right;
+}
+:not(.unread-thread) > .unread-mark-read {
+  visibility: hidden;
+}
 
 /* Thread Updater */
 #updater {
diff --git a/src/main/Main.coffee b/src/main/Main.coffee
index 7ec67988b..4d1a61e25 100644
--- a/src/main/Main.coffee
+++ b/src/main/Main.coffee
@@ -510,6 +510,7 @@ Main =
     ['Thread Expansion',          ExpandThread]
     ['Favicon',                   Favicon]
     ['Unread',                    Unread]
+    ['Mark Read from Index',      UnreadIndex]
     ['Quote Threading',           QuoteThreading]
     ['Thread Stats',              ThreadStats]
     ['Thread Updater',            ThreadUpdater]