Grenay (; ) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France. It is part of the arrondissement of Lens, the canton of Wingles and the Communaupole de Lens-Liévin. The current mayor is Christelle Buissette, elected in 2023.
An ex-coalmining and light industrial town situated some northwest of Lens, at the junction of the D165 and the D58.
Excavation of the Mine 11 at Grenay by the Compagnie des mines de Béthune began in October 1904. Excavation of the Shaft 11bis, for ventilation, began in May 1906. Extraction started in April 1908. The shafts were back-filled in 1967 and the surface installions destroyed in 1969.