John Everitt Frost, DFC & Bar (16 July 1918 – 16 June 1942) was a South African fighter ace during the Second World War. He was the highest-scoring member of a South African Air Force squadron during the war, credited with the destruction of 15 Axis aircraft. South African pilots with higher numbers of kills, such as Pat Pattle and Adolph "Sailor" Malan, were members of the British Royal Air Force.