18th Street may refer to:

Los Angeles 18th Street gang, an Hispanic street gang

Manhattan, New York City 18th Street (IRT Broadway – Seventh Avenue Line); a subway station serving the trains 18th Street (IRT Lexington Avenue Line), an abandoned subway station; formerly serving the trains 18th Street (IRT Third Avenue Line), (demolished) 18th Street (IRT Sixth Avenue Line), (demolished)

Chicago 18th station, an "L" station 18th station (CTA South Side Elevated), a former "L" station 18th Street station (Illinois), a station on Metra Electric District

Washington, D.C. 18th Street NW (Washington, D.C.)

See also