| National Union | |
| Native Name: | Unión Nacional |
| Country: | Spain |
| Foundation: | January 1900 |
| Ideology: | Regenerationism |
| State: | Spain |
The National Union (es|Unión Nacional, UN) was a regenerationist Spanish political party launched in January 1900. One of its main members was Joaquín Costa. It had little electoral success and disbanded by 1902.