diff --git a/src/builtin/range.zig b/src/builtin/range.zig
index 0fe30cba..e9cb657d 100644
--- a/src/builtin/range.zig
+++ b/src/builtin/range.zig
@@ -71,3 +71,17 @@ pub fn invert(ctx: *obj.NativeCtx) c_int {
 
     return 1;
 }
+
+pub fn subsetOf(ctx: *obj.NativeCtx) c_int {
+    const rangeA = ctx.vm.peek(1).obj().access(obj.ObjRange, .Range, ctx.vm.gc).?;
+    const rangeB = ctx.vm.peek(0).obj().access(obj.ObjRange, .Range, ctx.vm.gc).?;
+
+    ctx.vm.push(
+        Value.fromBoolean(
+            @min(rangeA.low, rangeA.high) >= @min(rangeB.low, rangeB.high) and
+                @max(rangeA.low, rangeA.high) <= @max(rangeB.low, rangeB.high),
+        ),
+    );
+
+    return 1;
+}
diff --git a/src/obj.zig b/src/obj.zig
index f3127c99..a40ae762 100644
--- a/src/obj.zig
+++ b/src/obj.zig
@@ -2499,6 +2499,7 @@ pub const ObjRange = struct {
             .{ "toList", buzz_builtin.range.toList },
             .{ "len", buzz_builtin.range.len },
             .{ "invert", buzz_builtin.range.invert },
+            .{ "subsetOf", buzz_builtin.range.subsetOf },
         },
     );
 
@@ -2507,6 +2508,7 @@ pub const ObjRange = struct {
             .{ "toList", "extern Function toList() > [int]" },
             .{ "len", "extern Function len() > int" },
             .{ "invert", "extern Function invert() > rg" },
+            .{ "subsetOf", "extern Function subsetOf(rg other) > bool" },
         },
     );