Archibald Simpson (4 May 1790 – 23 March 1847) was a Scottish architect, who along with his rival John Smith, is regarded as having fashioned the character of Aberdeen as "The Granite City".

At 13 he entered Marischal College but left after a year, on the death of his father, to work in the office of James Massie, a builder at Castlehill, having been influenced so by his uncle William Dauney.

[1][2] Simpson, along with his brother Alexander, was responsible for reviving the Aberdeen Musical Society, founded in 1747, in a move to make influential social contacts which were vital to the success of his architectural practice.

Clients frequently placed him in open competition with John Smith, though they greatly respected one another's work and ambition to achieve civic unity in the new streets that were then under construction.

The Aberdeen Civic Society erected a granite memorial to him in the gardens of Bon Accord Square, as part of the European Architectural Heritage Year in 1975.