| USI | |
| Location Country: | Portugal |
| Affiliation: | CESI |
| Members: | 15,000 |
| Full Name: | Union of Independent Trade Unions |
| Native Name: | União dos Sindicatos Independentes |
| Founded: | November 2000 |
| Headquarters: | Lisbon |
| Key People: | Paulo Gonçalves Marcos, president |
| Website: | www.usi.pt |
The Union of Independent Trade Unions (USI) is a national trade union center in Portugal founded on 18 November 2000. It is composed of 14 trade unions from the public services, banking, transport and energy sectors.[1]