| Competition: | Primera B de Chile |
| Season: | 2012 Primera B |
| Winners: | San Marcos de Arica |
| Promoted: | San Marcos de Arica |
| Prevseason: | 2011-C |
| Nextseason: | 2012-C |
The 2012 Torneo Clausura was part of the 62nd completed season of the Primera B de Chile.
San Marcos de Arica was tournament's champion.[1]