Harlem/Lake, announced as Harlem, is a station on the Chicago Transit Authority's 'L' system, serving the Green Line.

The Lake Street Elevated went further through Oak Park and was built to Marion Street in 1901 and extended just a few blocks west past Harlem Avenue to Forest Park station on May 20, 1910.

It was built at street-level and the tracks also paralleled the adjacent Chicago & North Western Railroad and the street-level operation began to result a number of crossing accidents for both railroads, typically due to pedestrians and wagon drivers failing to take note of approaching trains.

Harlem was a consolidation of the Forest Park and Marion stations.

The station is located at 1 South Harlem Avenue and is the northwestern terminus of the Green Line.