diff --git a/modules/services/window-managers/i3-sway/lib/functions.nix b/modules/services/window-managers/i3-sway/lib/functions.nix
index 38966faf1..5f661ca89 100644
--- a/modules/services/window-managers/i3-sway/lib/functions.nix
+++ b/modules/services/window-managers/i3-sway/lib/functions.nix
@@ -150,7 +150,8 @@ rec {
   windowCommandsStr = { command, criteria, ... }:
     "for_window ${criteriaStr criteria} ${command}";
   workspaceOutputStr = item:
-    ''workspace "${item.workspace}" output "${item.output}"'';
+    let outputs = concatMapStringsSep " " strings.escapeNixString item.output;
+    in ''workspace "${item.workspace}" output ${outputs}'';
 
   indent = list:
     { includesWrapper ? true, level ? 1 }:
diff --git a/modules/services/window-managers/i3-sway/lib/options.nix b/modules/services/window-managers/i3-sway/lib/options.nix
index 6c9f38da4..650b42c5b 100644
--- a/modules/services/window-managers/i3-sway/lib/options.nix
+++ b/modules/services/window-managers/i3-sway/lib/options.nix
@@ -912,11 +912,12 @@ in {
             };
 
             output = mkOption {
-              type = str;
+              type = with types; either str (listOf str);
               default = "";
+              apply = lists.toList;
               example = "eDP";
               description = ''
-                Name of the output from <command>
+                Name(s) of the output(s) from <command>
                   ${if isSway then "swaymsg" else "i3-msg"} -t get_outputs
                 </command>.
               '';
diff --git a/tests/modules/services/window-managers/i3/i3-workspace-output-expected.conf b/tests/modules/services/window-managers/i3/i3-workspace-output-expected.conf
index c4d36b656..d765ac175 100644
--- a/tests/modules/services/window-managers/i3/i3-workspace-output-expected.conf
+++ b/tests/modules/services/window-managers/i3/i3-workspace-output-expected.conf
@@ -98,3 +98,4 @@ workspace "1" output "eDP"
 workspace "ABC" output "DP"
 workspace "3: Test" output "HDMI"
 workspace "!"§$%&/(){}[]=?\*#<>-_.:,;²³" output "DVI"
+workspace "Multiple" output "DVI" "HDMI" "DP"
diff --git a/tests/modules/services/window-managers/i3/i3-workspace-output.nix b/tests/modules/services/window-managers/i3/i3-workspace-output.nix
index 8dcae4f81..4e31acdef 100644
--- a/tests/modules/services/window-managers/i3/i3-workspace-output.nix
+++ b/tests/modules/services/window-managers/i3/i3-workspace-output.nix
@@ -6,6 +6,7 @@ let
     ws2 = "ABC";
     ws3 = "3: Test";
     ws4 = ''!"§$%&/(){}[]=?\*#<>-_.:,;²³'';
+    ws5 = "Multiple";
   };
 
 in {
@@ -31,6 +32,10 @@ in {
         workspace = "${i3.ws4}";
         output = "DVI";
       }
+      {
+        workspace = "${i3.ws5}";
+        output = [ "DVI" "HDMI" "DP" ];
+      }
     ];
   };
 
diff --git a/tests/modules/services/window-managers/sway/sway-workspace-output-expected.conf b/tests/modules/services/window-managers/sway/sway-workspace-output-expected.conf
index 2e02cec60..c19373d1e 100644
--- a/tests/modules/services/window-managers/sway/sway-workspace-output-expected.conf
+++ b/tests/modules/services/window-managers/sway/sway-workspace-output-expected.conf
@@ -107,4 +107,5 @@ workspace "1" output "eDP"
 workspace "ABC" output "DP"
 workspace "3: Test" output "HDMI"
 workspace "!"§$%&/(){}[]=?\*#<>-_.:,;²³" output "DVI"
+workspace "Multiple" output "DVI" "HDMI" "DP"
 exec "/nix/store/00000000000000000000000000000000-dbus/bin/dbus-update-activation-environment --systemd DISPLAY WAYLAND_DISPLAY SWAYSOCK XDG_CURRENT_DESKTOP XDG_SESSION_TYPE NIXOS_OZONE_WL; systemctl --user start sway-session.target"
diff --git a/tests/modules/services/window-managers/sway/sway-workspace-output.nix b/tests/modules/services/window-managers/sway/sway-workspace-output.nix
index e096aa1f4..47fb7527e 100644
--- a/tests/modules/services/window-managers/sway/sway-workspace-output.nix
+++ b/tests/modules/services/window-managers/sway/sway-workspace-output.nix
@@ -6,6 +6,7 @@ let
     ws2 = "ABC";
     ws3 = "3: Test";
     ws4 = ''!"§$%&/(){}[]=?\*#<>-_.:,;²³'';
+    ws5 = "Multiple";
   };
 
 in {
@@ -34,6 +35,10 @@ in {
         workspace = "${i3.ws4}";
         output = "DVI";
       }
+      {
+        workspace = "${i3.ws5}";
+        output = [ "DVI" "HDMI" "DP" ];
+      }
     ];
   };