Assinie-Mafia is a coastal resort town in south-eastern Ivory Coast. It is a sub-prefecture of Adiaké Department in Sud-Comoé Region, Comoé District.

Assinie-Mafia is located 80 kilometres east of Abidjan along the coast of the Gulf of Guinea. Access to the area is by road A100 going east from Abidjan then turning right to the B-107 road (Route Assinie) then Route Assinie-Mafia along the coast. The road ends at Assinie-Mafia. Assinie-Mafia is a long narrow settlement along the coast on both sides of the outlet of Aby Lagoon.

Assinie-Mafia was a commune until March 2012, when it became one of 1,126 communes nationwide that were abolished.

The Assinie area starts at the location of the Paul-Emile Durand cottage in the west bordered to the south by the ocean and accessible by the Assinie-Mafia road. Opposite the town of Assinie-Mafia is a narrow peninsula (100–1000 m wide) extending from the west and 15 km long which is occupied by luxury villas and huts. Access is by car, private boats, or canoes across the lagoon.

The mouth of the lagoon which marks the end of the Assinie-Mafia peninsula is called La Passe where the high-rise resort and the smoking of tchoukourou is very popular.

The area is a favourite destination for wealthy inhabitants of Abidjan for the weekend.

Assinie-Mafia was the location of the film French Fried Vacation (Les Bronzés) in 1978.

In 2014, the population of the sub-prefecture of Assinie-Mafia was 16,721.