diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index 515d17a19..7219b3695 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -32,6 +32,7 @@ Added
   in rapid mode.
 - New `{clipboard}` and `{primary}` replacements for the commandline which
   replace the `:paste` command.
+- New `:window-only` command to close all other windows.
 
 Changed
 ~~~~~~~
diff --git a/qutebrowser/browser/commands.py b/qutebrowser/browser/commands.py
index 2964b6113..44fdeff5b 100644
--- a/qutebrowser/browser/commands.py
+++ b/qutebrowser/browser/commands.py
@@ -769,6 +769,13 @@ class CommandDispatcher:
             raise cmdexc.CommandError("Can't zoom {}%!".format(level))
         message.info(self._win_id, "Zoom level: {}%".format(level))
 
+    @cmdutils.register(instance='command-dispatcher', scope='window')
+    def window_only(self):
+        """Close all windows except for the current one."""
+        for win_id, window in objreg.window_registry.items():
+            if win_id != self._win_id:
+                window.close()
+
     @cmdutils.register(instance='command-dispatcher', scope='window')
     def tab_only(self, left=False, right=False):
         """Close all tabs except for the current one.
diff --git a/tests/end2end/features/misc.feature b/tests/end2end/features/misc.feature
index 41b2e06f7..77e00d7a8 100644
--- a/tests/end2end/features/misc.feature
+++ b/tests/end2end/features/misc.feature
@@ -525,6 +525,20 @@ Feature: Various utility commands.
             - data/hints/link_blank.html
             - data/hello.txt (active)
 
+    @no_xvfb
+    Scenario: :window-only
+        Given I run :tab-only
+        And I open data/hello.txt
+        When I open data/hello2.txt in a new tab
+        And I open data/hello3.txt in a new window
+        And I run :window-only
+        Then the session should look like:
+            windows:
+            - tabs:
+              - active: true
+                history:
+                - url: http://localhost:*/data/hello3.txt
+
     ## Variables
 
     Scenario: {url} as part of an argument