| Merged | Seafarers International Union of North America (June 3, 2001) |
|---|---|
| Founded | May 1937 |
| Headquarters | New York City, New York |
| Location | |
| Affiliations | Congress of Industrial Organizations, later AFL–CIO |
The National Maritime Union (NMU) was an American labor union founded in May 1937. It affiliated with the Congress of Industrial Organizations (CIO) in July 1937. After a failed merger with a different maritime group in 1988, the union merged with the Seafarers International Union of North America in 2001.