Colquhoun is a surname. It may also refer to:
Colquhoun Grant (British cavalry general) (1772–1835), British Army lieutenant-general in the Napoleonic Wars Colquhoun Grant (British intelligence officer) (1780–1829), British Army lieutenant-colonel and Napoleonic Wars intelligence officer Clan Colquhoun, a Highland Scottish clan Colquhoun baronets, two baronetcies, one in the Baronetage of Nova Scotia and one in the Baronetage of Great Britain Colquhoun Peak, a mountain in Washington state, United States Colquhoun railway station, Victoria, Australia, a former railway station