David McDowall Grant (20 July 1761 – 27 June 1841), of Arndilly, Banff and Barr House, Lochwinnoch, was a Scottish naval officer, collector of customs and, briefly, Member of Parliament. He was the 5th surviving son of William McDowall, Member of Parliament for Renfrewshire from 1768 to 1774, and Elizabeth Graham. His eldest brother, William McDowall, was also a Member of Parliament for Renfrewshire, Ayrshire and the Glasgow Burghs, and another elder brother, Hay MacDowall was a Lieutenant General and General Officer Commanding, Ceylon . In 1790 he married Eleanor Mary, daughter and heir of Col. Alexander Grant of Arndilly, taking the additional name of Grant.