Lac de Calacuccia, Artificial reservoir in Calacuccia, Corsica, France.

Lac de Calacuccia is a reservoir formed by a 72-metre-high, 265-metre-long dam on the Golo river, covering 119.6 hectares at 793 metres altitude. It lies between Calacuccia and Casamaccioli in the Niolu, with Monte Cinto (2,710 m), Capu a u Perdatu (2,583 m) and Paglia Orba (2,525 m) to the north and Capu di a Facciatu (2,113 m) to the south.

The dam was built between 1965 and 1968 by Électricité de France and entered service in 1968. In August 1964 about 500 people led by the canton's elected representatives demonstrated against the project, which would submerge 140 hectares, a quarter of them gardens and orchards. The departmental assembly had voted 52 to 5 in favour of the EDF and Somivac concessions in January 1964.

The surrounding area preserves traditional Corsican mountain culture through stone villages, local gastronomy featuring sheep cheese and traditional charcuterie, reflecting centuries-old pastoral and agricultural heritage practices.

The lake is accessible via road routes from nearby towns and offers hiking and photography opportunities, though swimming and boating activities are regulated due to dam operations and water management protocols.

This facility generates up to 57 MW of electricity, supplying approximately 10% of Corsica's power needs while supporting downstream irrigation through a Somivac-managed pipeline network serving the Bastia plains.