La Marsa () is a coastal town in far north eastern Tunisia near the capital Tunis. It is located at around . The population is estimated as 65,742, as of 2006. The old summer capital of pre-colonial Tunisia, it is today a popular vacation spot for many middle class Tunisians.
It is connected to Tunis by the TGM railway. Gammarth is adjacent to La Marsa further up the coast.