Sir Ian Zachary Malcolm, 17th Laird of Poltalloch, KCMG was a Conservative Member of Parliament and Chieftain of the Clan Malcolm/MacCallum.

The Clan Malcolm, also known as the Clan MacCallum, is a Highland Scottish clan. The Clan MacCallum may have originally been a separate clan until the 18th century, when the chief of the Clan MacCallum adopted the name Malcolm after inheriting the Malcolm estate, and the two clans were drawn together under the same chief.