Piereis (Greek: Πιερείς) is a former municipality in the Kavala regional unit, East Macedonia and Thrace, Greece.

Since the 2011 local government reform it is part of the municipality Pangaio, of which it is a municipal unit.

[2] The municipal unit has an area of 143.402 km2.

The seat of the municipality was in Moustheni.

This Eastern Macedonia and Thrace location article is a stub.