Korissia () is a former municipality on the island of Corfu, Ionian Islands, Greece. Since the 2019 local government reform it is part of the municipality South Corfu, of which it is a municipal unit. It is in the southern part of the island. It has a land area of 27.675 km<sup>2</sup>. The seat of the municipality was the town of Argyrades.
The municipal unit Korissia is subdivided into the following communities (constituent villages in brackets):