In Transportation
- State Highway 138 is a state highway route in Wall Township, New Jersey
- M-138 is a state highway route in Michigan
- U.S. Route 138 is an east-west highway in Colorado and Nebraska
- Highway 138 provincial highway in Ontario, Canada
- Route 138 in Quebec, Canada
- N-138 is a highway in Spain which connects Estadilla to the French Border
- 138th Street–Grand Concourse, the Bronx station on the IRT Jerome Avenue Line of the New York City Subway
- Third Avenue–138th Street, the Bronx station on the IRT Pelham Line of the New York City Subway
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