Katerini (Greek: Κατερίνη, former name: Αικατερίνη - Aikaterini; "Catherine") is a town in Central Macedonia, Greece, the capital of Pieria regional unit. It lies on the Pierian plain, between Mt. Olympus and the Thermaikos Gulf, at an altitude of 14 m. The town, which is one of the newest in Greece, has a population of 83,764 (according to the 2001 census). It is near the city of Thessaloniki, Greece's second largest city, which has been beneficial for Katerini's development over recent years. Katerini is accessible from the main Thessaloniki–Athens highway GR-1/E75 (with two interchanges near the town) and the Egnatia Odos to the north. It is served by both Intercity and local trains on the main railway line from Athens to Thessaloniki and there is a comprehensive regional and national bus service with its hub in the town.

A popular tourist destination, Katerini is close to the sea (6 km) and to several archaeological sites of great interest such as the ancient city of Dion (5th century BC, 17 km away) and the Venetian Castle of Platamon. The beaches of Korinos, Paralia and Olympiaki Akti (or Katerinoskala) are visited by both Greek and international tourists during the summer. The base of Mount Olympus and the town of Litochoro, are at a distance of around 20 kilometres from the centre of Katerini.