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.)