Collairnie Castle is an L-plan castle in Dunbog, Fife, Scotland. The castle was extended in the 16th century, with a wing added of 4 storeys with an attic. The main block has been reduced to a single storey, and the tower is now incorporated into a 19th-century farm steading. It is described as having "become an embarrassment as the work of the farm subscribes" it. Inside the remaining floors are two painted ceilings.