Grand-Lahou is a coastal town in southern Ivory Coast.

It is a sub-prefecture of and the seat of Grand-Lahou Department in Grands-Ponts Region, Lagunes District.

Grand-Lahou is situated at the mouth of the Bandama River on the Gulf of Guinea.

It was occupied by the British, Germans and Dutch before the French, from 1890 onward, began to develop it as a trading port.

[2] The twenty villages of the sub-prefecture of Grand-Lahou and their population in 2014 are:[3]