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)