Paliokastro (Greek: Παληόκαστρο) is a former municipality in the Trikala regional unit, Thessaly, Greece.

[2] It is located in the east-northeastern part of the regional unit.

Its population was 2,316 at the 2021 census,[1] and it has a land area of 197.878 km².

[3] The seat of the municipality was in the village of Palaiopyrgos (pop.

The name of the municipality comes from the greek words παληο, paleo + κάστρο, kastro meaning "old castle" (from the name of the village Palaiopyrgos, "old tower").