Royal Naval Air Station Donibristle or more simply RNAS Donibristle was a former Fleet Air Arm base located 2.7 miles (4.3 km) east of Rosyth, Fife, and 8.7 miles (14.0 km) northwest of Edinburgh. It was also known as HMS Merlin.

Donibristle was a house and estate in Fife, Scotland, on the coast of the Firth of Forth. Only the wings of the house remain, within the modern settlement of Dalgety Bay. They are now protected as a category A listed building. Donibristle was the scene of the killing of James Stewart, 2nd Earl of Moray, in 1592, which is remembered in the ballad "The Bonnie Earl O' Moray".