Messatida (Greek: Μεσσάτιδα) is a former municipality in Achaea, West Greece, Greece. Since the 2011 local government reform it is part of the municipality Patras, of which it is a municipal unit. The seat of the municipality was in Ovrya. It is located south of Patras city centre, and stretches from the urbanized plains near the Gulf of Patras to the Omplos hills in the east. The population was 13,852 in 2011. It has an area of 66.37 km².
Messatida was named after the ancient Achaean town Mesatis, according to local legend the place where Dionysus was reared.