USS Nabigwon (YTB-521/YTM-521) was a Hisada-class harbor tug in the service of the United States Navy.

The name "Nabigwon" is taken from a Native American language, meaning "ship".

Nabigwon was assigned advanced base duty in the Pacific.

Nabigwon was sold by the Defense Reutilization and Marketing Service (DRMS) for scrapping on 28 July 1987.

This article about a specific ship or boat of the United States Armed Forces is a stub.