Harbour Tunnel or Harbor Tunnel may refer to:
Australia
- Sydney Harbour Tunnel, New South Wales
- Western Harbour Tunnel, New South Wales
Finland
- Helsinki harbour tunnel
Hong Kong
- Cross-Harbour Tunnel, Hong Kong
United States
- Baltimore Harbor Tunnel and associated Harbor Tunnel Thruway, Maryland
- Cross-Harbor Rail Tunnel in New York Harbor between New York and New Jersey
- Ted Williams Tunnel (also known as Third Harbor Tunnel) in Boston Harbor, Massachusetts
See also
- Harbour Bridge (disambiguation)
- Harbour Crossing (disambiguation)