Iain Macnab of Barachastlain (21 October 1890 – 24 December 1967) was a Scottish wood-engraver and painter.

As a prominent teacher he was influential in the development of the British school of wood-engraving.

[2] His concepts of the sense of motion which could be created by the shape of repetitive parallel lines were of profound influence, in particular in relation to the art of linocut – an art form which both he and Claude Flight pioneered at the Grosvenor School of Modern Art where with the teachers included Cyril Power and Sybil Andrews.

[5] Macnab served in France in the First World War as a captain in the Argyll and Sutherland Highlanders.

[6] He rejoined the military in the Second World War, despite his age, and became a pilot officer in the Royal Air Force Volunteer Reserve.