Gertrude Lilian Entwisle (12 June 1892 – 18 November 1961) was an electrical engineer. She was the first British woman to retire from a complete career in industry as a professional engineer; the first female engineer to work at British Westinghouse; and the first female student, graduate, and associate member of the Institution of Electrical Engineers (now the Institution of Engineering and Technology). Entwisle was known for her work on designing DC motors and exciters. Her obituary said she broke "barriers of prejudice to become a respected designer of electrical rotating machinery."