Savage Mostyn was an officer of the Royal Navy who saw service during the War of the Austrian Succession and the Seven Years' War. He embarked on a political career, and was a Member of Parliament, Comptroller of the Navy, and one of the Lords of the Admiralty.

The Comptroller of the Navy originally called the Clerk Comptroller of the Navy was originally a principal member of the English Navy Royal, and later the British Royal Navy, Navy Board. From 1512 until 1832, the Comptroller was mainly responsible for all British naval spending and directing the business of the Navy Board from 1660 as its chairman. The position was abolished in 1832 when the Navy Board was merged into the Board of Admiralty. The comptroller was based at the Navy Office.