Corsica is a borough in Jefferson County, Pennsylvania, United States.

Corsica suffered a devastating fire in 1873, which destroyed most of the town's businesses and residences.

U.S. Route 322 passes through the center of town as Main Street, and leads east 6 miles (10 km) to Brookville, the Jefferson county seat, and west 10 miles (16 km) to Clarion.

Interstate 80 passes just north of the borough limits, with access from Exit 73 (Pennsylvania Route 949).

According to the United States Census Bureau, the borough of Corsica has a total area of 0.40 square miles (1.04 km2), all land.

The Clarion-Limestone Area School District provides kindergarten through 12th grade public education for the community.