Duncan MacKay (14 July 1937 – 23 December 2019) was a Scottish footballer who played for Celtic, Third Lanark, Melbourne Croatia, Perth Azzurri and the Scotland national team. Born in Glasgow, Mackay turned professional when he joined Celtic from Maryhill Harp, aged 17, in 1955. He developed rapidly, making his club debut within two years and earning the first of an eventual 14 caps for the Scottish national side four years later. MacKay died on 23 December 2019, aged 82.