Franciszek "Frank" Gruszka (21 January 1910 – 18 August 1940), Polish soldier (porucznik), Flying Officer (F/O) of the Royal Air Force during the Battle of Britain.

Serving in the Army from 1931, he graduated from the Polish Air Force Academy in Dęblin (8th honorary promotion of 15 August 1934) and was commissioned as a pilot instructor in 111/6 squadron based near Lwów.

In the spring of 1975 a World War II aviation archeology group found the remnants of an airplane and its pilot in marshes between Preston Village and Stodmarsh, East Sussex.

F/O Franciszek Gruszka was buried with full British military honors at the Polish War Memorial on the outskirts of RAF Northolt, London (grave no.

Present at the service were Jeffrey Quill, the former Spitfire test pilot, and Dave Glaser, both of whom had served with Gruszka in 65 Squadron during the Battle of Britain.