Olympus or Olympos (Ancient Greek: Ὄλυμπος) may refer to:
Mount Olympus (Greek: Όλυμπος - Olympos) is a mountain in the east central part of the island of Euboea, Greece. Its maximum elevation is 1,172 m. It is not the highest mountain of Euboea, that is 1,743 m high Dirfi, 16 km to the north. The Olympus is 10 km north of Amarynthos, 11 km northeast of Eretria and 24 km east of the city of Chalcis. There are forests on the northern slopes while most of the mountain range is covered with grassland and bushes.
Olympos (Greek: Ὄλυμπος; Latin: Olympus) was an ancient city in Lycia. It was situated in a river valley near the coast. Its ruins are located south of the modern town Çıralı in the Kumluca district of Antalya Province, Turkey. Together with the sites of the ancient cities Phaselis and Idyros it is part of the Olympos Beydaglari National Park. The perpetual gas fires at Yanartaş are found a few kilometers to the northwest of the site.
The exact date of the city's foundation is unknown. A wall and an inscription on a sarcophagus have been dated to the end of the 4th century BC, so Olympus must have been founded at the latest in the Hellenistic period. The city presumably taking its name from nearby Mount Olympos (Turkish: Tahtalı Dağı, Timber Mountain), one of over twenty mountains with the name Olympos in the Classical world.
The city was a member of the Lycian League, but it is uncertain when it joined the League. It started minting Lycian League coins from the end of the second century BC, possibly the 130s. At this time Olympos was one of the six largest cities of the League, which possessed three votes each.