Josephus Antoon Louisa "Jef" Mermans (16 February 1922 in Merksem – 20 January 1996 in Wildert), nicknamed "The Bomber", was a football striker from Belgium, who played much of his career at Anderlecht, with whom he won seven Belgian Championship titles and finished top scorer of this competition three times.

His progress caught the attention of the federal coach and Jef was selected for a Belgium B squad match against Luxembourg in January 1939.

A member of the Anderlecht staff arrived at Borgerhout in 1942 with a blank check that was filled in with the record sum of 125,000 Belgian francs in a quarter of an hour.

In 1947, Mermans was the key player in the conquest of the first Anderlecht title in first division as he scored 38 goals (succeeding to Bert De Cleyn as top scorer).

[5] In 1957, the Bomber, as he was called for his powerful strikes, left Anderlecht for the small K. Olse Merksem club in his native town.