diff --git a/CHANGELOG.md b/CHANGELOG.md
index df413db..b39891d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ It's about time I started a changelog! This will serve from now on as the main c
 Note to self: See the bottom of this file for the release template text.
 
 
+## v1.15: The untitled update (unreleased)
+- Added the optional argument `all` to [`//unmark`](https://worldeditadditions.mooncarrot.space/Reference/#unmark)
+
+
 ## v1.14.5: The multipoint update, hotfix 5 (1st August 2023)
 - Fix a bug where creative players in survival couldn't punch out position markers
 - Added `//listentities`, which lists all currently loaded `ObjectRef`s. This is intended for debugging mods - thanks to @Zughy in #103
diff --git a/worldeditadditions_commands/commands/selectors/unmark.lua b/worldeditadditions_commands/commands/selectors/unmark.lua
index dc8a557..90ac999 100644
--- a/worldeditadditions_commands/commands/selectors/unmark.lua
+++ b/worldeditadditions_commands/commands/selectors/unmark.lua
@@ -6,26 +6,45 @@ if minetest.registered_chatcommands["/unmark"] then
 	worldedit_unmark = minetest.registered_chatcommands["/unmark"].func
 end
 
+local function do_unmark_all()
+	local items_removed = 0
+	for id, obj in pairs(minetest.object_refs) do
+		if obj.get_luaentity then
+			local luaentity = obj:get_luaentity()
+			if luaentity and (luaentity.name == "worldeditadditions:marker_wall" or luaentity.name == "worldeditadditions:position") then
+				obj:remove()
+				items_removed = items_removed + 1
+			end
+		end
+	end
+	return items_removed
+end
+
 local function do_unmark(name, params_text)
 	-- Hide the WorldEdit marker, if appropriate
 	if type(worldedit_unmark) == "function" then
 		worldedit_unmark(name, params_text)
 	end
-
-	-- Hide the WorldEditAdditions marker
-	weac.pos.unmark(name)
+	
+	if params_text == "all" then
+		local removed = do_unmark_all()
+		worldedit.player_notify(name, "Hidden "..removed.." marker entities")
+	else
+		-- Hide the WorldEditAdditions marker
+		weac.pos.unmark(name)
+	end
 end
 
 if minetest.registered_chatcommands["/unmark"] then
 	minetest.override_chatcommand("/unmark", {
-		params = "",
-		description = "Hide the markers for the defined region (and any other positions), but do not remove the points themselves.",
+		params = "[all]",
+		description = "Hide the markers for the defined region (and any other positions), but do not remove the points themselves. If the optional argument keyword 'all' is supplied, then all loaded markers are hidden, regardless of player ownership.",
 		func = do_unmark
 	})
 else
 	minetest.register_chatcommand("/unmark", {
-		params = "",
-		description = "Hide the markers for the defined region (and any other positions), but do not remove the points themselves.",
+		params = "[all]",
+		description = "Hide the markers for the defined region (and any other positions), but do not remove the points themselves. If the optional argument keyword 'all' is supplied, then all loaded markers are hidden, regardless of player ownership.",
 		privs = { worldedit = true },
 		func = do_unmark
 	})