Frank Rowbotham Foster (31 January 1889 – 3 May 1958) was an English amateur cricketer who played for Warwickshire County Cricket Club from 1908 to 1914, and in Test cricket for England in 1911 and 1912. He was born in Birmingham and died in Northampton. His career was cut short after a motor-cycle accident during World War I.
Foster was an all-rounder. As a right-handed batsman, he scored 6,548 career runs in 159 first-class matches at an average of 26.61 runs per completed innings with a highest score of 305* as one of seven centuries. He was a left-arm fast medium bowler and took 717 first-class wickets with a best return of 9/118. He took five wickets in an innings 53 times and ten wickets in a match 8 times with a best return of 12/92. As a fielder, Foster completed 121 catches.