Formakin House is an early 20th-century mansion and estate in Renfrewshire, Scotland. It is located 2 kilometres (1.2 mi) south of the Firth of Clyde, and 2.5 kilometres (1.6 mi) west of Bishopton. Formakin was designed by Robert Lorimer for wealthy businessman John Holms, though the main house was never completed. It declined during the 20th century, but in the 1990s, restoration of the estate buildings was completed.