diff --git a/docs/changelog.rst b/docs/changelog.rst
index 019b263f0..2484c6172 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -38,7 +38,10 @@ Detailed list of changes
 0.30.0 [future]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-- kitty @ ls: Add user variables set on windows to the output (:iss:`6502`)
+- kitten @ set-user-vars: New remote control command to set user variables on a
+  window (:iss:`6502`)
+
+- kitten @ ls: Add user variables set on windows to the output (:iss:`6502`)
 
 0.29.2 [2023-07-27]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/kitty/rc/set_user_vars.py b/kitty/rc/set_user_vars.py
new file mode 100644
index 000000000..712e3a1ca
--- /dev/null
+++ b/kitty/rc/set_user_vars.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+# License: GPLv3 Copyright: 2020, Kovid Goyal <kovid at kovidgoyal.net>
+
+from typing import TYPE_CHECKING, Optional
+
+from .base import MATCH_WINDOW_OPTION, ArgsType, Boss, PayloadGetType, PayloadType, RCOptions, RemoteCommand, ResponseType, Window
+
+if TYPE_CHECKING:
+    from kitty.cli_stub import SetUserVarsRCOptions as CLIOptions
+
+
+class SetUserVars(RemoteCommand):
+
+    protocol_spec = __doc__ = '''
+    var/list.str: List of user variables of the form NAME=VALUE
+    match/str: Which windows to change the title in
+    '''
+
+    short_desc = 'Set user variables on a window'
+    desc = (
+        'Set user variables for the specified windows. If you use the :option:`kitty @ set-window-title --match` option'
+        ' the variables will be set for all matched windows. By default, only the window'
+        ' in which the command is run is affected. If you do not specify any variables, the'
+        ' current variables are printed out, one per line. To unset a variable specify just its name.'
+    )
+    options_spec = MATCH_WINDOW_OPTION
+    args = RemoteCommand.Args(json_field='var', spec='[NAME=VALUE ...]')
+
+    def message_to_kitty(self, global_opts: RCOptions, opts: 'CLIOptions', args: ArgsType) -> PayloadType:
+        return {'match': opts.match, 'var': args, 'self': True}
+
+    def response_from_kitty(self, boss: Boss, window: Optional[Window], payload_get: PayloadGetType) -> ResponseType:
+        remove = set()
+        val = {}
+        for x in payload_get('var') or ():
+            a, sep, b = x.partition('=')
+            if sep:
+                val[a] = b
+            else:
+                remove.add(a)
+        lines = []
+        for window in self.windows_for_match_payload(boss, window, payload_get):
+            if window:
+                if val or remove:
+                    window.user_vars.update(val)
+                    for x in remove:
+                        window.user_vars.pop(x, None)
+                else:
+                    lines.append('\n'.join(f'{k}={v}' for k, v in window.user_vars.items()))
+        return '\n\n'.join(lines)
+
+
+set_user_vars = SetUserVars()