Gillespie, Kidd & Coia was a Scottish architectural firm famous for their application of modernism in churches and universities, as well as at St Peter's Seminary in Cardross. Though founded in 1927, they are best known for their work in the post-war period. The firm was wound up in 1987.

St. Peter's Seminary is a former Roman Catholic seminary near Cardross, Argyll and Bute, Scotland. Designed by the firm of Gillespie, Kidd & Coia, it has been described by the international architecture conservation organisation Docomomo International as a modern "building of world significance". It is one of only 42 post-war buildings in Scotland to be listed at Category A, the highest level of protection for a building of "special architectural or historic interest". It has been abandoned since 1987, and is currently in a ruined state. In July 2020, the site was given to the Kilmahew Education Trust Ltd who plan to reinstate the educational elements of the Seminary Complex after conservation and restoration.