Alexander Buchanan Campbell (14 June 1914 – June/July 2007) was a Scottish architect. He was born in Glasgow, Scotland.
He studied at the Glasgow School of Art (where he later taught) and was apprenticed to the firm of Gillespie, Kidd and Coia.
One of Buchanan Campbell's most notable works was the Dollan Baths complex in East Kilbride (opened 1968). Influenced by the Beaux-Arts style, his time with Coia and works of Pier Luigi Nervi and Kenzo Tange, the significance of Buchanan Campbell's Dollan Baths was recognised when Historic Scotland listed it as Grade A in 2002.
Other significant work includes Craigie College, Ayr and alterations to Gillespie, Kidd and Coia's Notre Dame College in Bearsden, Glasgow.
In 1995 Buchanan Campbell gifted his papers to the Royal Commission on the Ancient and Historical Monuments of Scotland.