Duncan MacKay or McKay may refer to:
Duncan MacKay (footballer) (1937–2019), Scottish former footballer Duncan Mackay (musician) (born 1950), British composer, singer and musician Duncan McKay (TV presenter), Scottish television presenter and podcaster Mickey MacKay (Duncan McMillan MacKay, 1894–1940), Canadian ice hockey centre Duncan McKay, a character from Monarch of the Glen (TV series)