The Tokyo Mizube Line is a water bus service in Tokyo. A public company called Tokyo Metropolitan Park Association operates the lines on Tokyo riverside. The services include public lines listed below, as well as event cruises and chartered ships. All lines close on Monday, and between December 29 and January 3.

A water taxi or a water bus is a watercraft used to provide public or private transport, usually, but not always, in an urban environment. Service may be scheduled with multiple stops, operating in a similar manner to a bus, or on demand to many locations, operating in a similar manner to a taxi. A boat service shuttling between two points would normally be described as a ferry rather than a water bus or taxi.