Westlake is an industrial city in Calcasieu Parish, in western Louisiana, United States, and is part of the Lake Charles metropolitan statistical area.

There are many chemical plants and oil refineries situated around the Westlake area.

Westlake is located in east-central Calcasieu Parish at 30°14′54″N 93°15′33″W / 30.24833°N 93.25917°W / 30.24833; -93.25917 (30.248455, -93.259047),[3] on the west bank of the Calcasieu River, just north of that river's entry into the water body of Lake Charles.

As of the 2020 United States census, there were 4,781 people, 1,935 households, and 1,178 families residing in the city.

As of Jan 2023, the current mayor of Westlake is Hal Mcmillin.