Arnamul (Scottish Gaelic: Arnamuil) is a stack off the west coast of Mingulay in the Western Isles, Scotland.

Although precipitous, sheep were grazed on its relatively flat summit during the human occupation of Mingulay.

[1] Haswell-Smith (2004) states that the name means "erne mound".

[1][3] It was ascended by a party of hill baggers in April 2018.

This article about a location in the Western Isles is a stub.