diff --git a/go/number-complement.go b/go/number-complement.go
new file mode 100644
index 0000000..fe46c97
--- /dev/null
+++ b/go/number-complement.go
@@ -0,0 +1,11 @@
+package main
+
+func findComplement(num int) int {
+	mask := 0
+	for tmp := num; tmp != 0; tmp >>= 1 {
+		mask <<= 1
+		mask |= 1
+	}
+
+	return num ^ mask
+}