Leroy Grumman, American engineer and businessman, co-founded Grumman Aeronautical Engineering Co. (d. 1982)

Leroy Randle "Roy" Grumman (4 January 1895 – 4 October 1982) was an American aeronautical engineer, test pilot, and industrialist. In 1929, he co-founded Grumman Aircraft Engineering Co., later renamed Grumman Aerospace Corporation, and now part of Northrop Grumman.