Colen Campbell (15 June 1676 – 13 September 1729) is a pioneering Scottish architect and architectural writer, credited as a founder of the Georgian style.

He spends most of his career in Italy and England.

A descendent of the Campbells of Cawdor Castle, he is believed to be the Colinus Campbell who graduated from the University of Edinburgh in July 1695.

He initially trains as a lawyer, being admitted Faculty of Advocates on the 29th July 1702.

He travels in Italy from 1695–1702 and is believed to be the Colinus Campbell who signed the visitor's book at the University of Padua in 1697.

He is believed to have trained in and studied architecture under James Smith; this belief is strengthened by Campbell owning several drawings of buildings designed by Smith.