Frederick Horsman (12 December 1889 – 15 May 1959) was an English professional footballer. He played as a full back in the Southern League for Watford, and later in the Football League for Watford, Doncaster Rovers, and Luton Town. He played in Watford's first ever Football League match, a 2–1 win against Queens Park Rangers on 28 August 1920.