Sidi Lakhdar (Arabic: سيدي لخضر) is a town and commune in Mostaganem Province, Algeria, about 300 km west of the capital, Algiers.

It is the capital of Sidi Lakhdar District.

According to the 1998 census, it has a population of 30,950.

[1] Under French colonial rule, the town was known as Lapasset.

This article about a location in Mostaganem Province is a stub.