| United Left of Cantabria | |
| Native Name: | Izquierda Unida de Cantabria |
| Leader1 Title: | General Coordinator |
| Leader1 Name: | Jorge Crespo[1] |
| Merger: | Communist Party of Cantabria Izquierda Abierta Communist Youth of Cantabria Republican Left Independents Party of Socialist Action (1986-2001) Progressive Federation (1986-1988) Carlist Party (1986-1987) Humanist Party (1986) |
| Headquarters: | C/ Isaac Peral nº1, 1ºB. Santander |
| Membership Year: | 2014 |
| Membership: | 220 official members[2] |
| Ideology: | Socialism Anticapitalism Communism Republicanism Feminism Federalism |
| Position: | Left-wing |
| National: | United Left |
| Affiliation1 Title: | Union affiliation |
| Affiliation1: | CCOO |
| Seats1 Title: | Town councillors |
| Website: | iucantabria.org |
| State: | Spain |
United Left of Cantabria (. IUC) is the Cantabrian federation of the Spanish left wing political and social movement United Left. Jorge Crespo is the current General Coordinator. The Communist Party of Cantabria (PCC-PCE, Cantabrian federation of the PCE) and Izquierda Abierta.
In the Cantabrian elections of 2011 IUC made a coalition with Izquierda Anticapitalista with the name Social and Ecologist Left.