Gérard "Jabby" Crombac (7 March 1929, Zurich – 18 November 2005, Paris) was a Swiss auto-racing journalist and author.

In 1959 he began managing the interests of Jo Schlesser in association with Jean Lucas, while working for French discount retailer Prisunic.

In 1962, after leaving Prisunic, Crombac partnered with Lucas to found the French magazine Sport Auto, where he was chief editor until 1989.

In 1973 he and a Sport Auto team composed of Thierry Lalande, Luc Melua and Jean-Louis Moncet, assembled a kitcar in one week-end.

Crombac and his wife Catherine had a son, who was named Colin James in honour of close friends Chapman and Clark.