Seleucia Sidera (Ancient Greek: Σελεύκεια η Σιδηρᾶ, Seleukeia hê Sidêra; Latin: Seleucia Ferrea), also transliterated as Seleuceia, Seleukeia, and later known as Claudioseleucia, Greek Klaudioseleukeia, was an ancient city in the northern part of Pisidia, Anatolia, near the village of Bayat (old name Selef), near Atabey, about 15 km north-northeast of Isparta, Isparta Province, in the Mediterranean Region of Turkey.

Founded by Seleucus I Nicator or Antiochus I Soter to protect the military road across northern Pisidia.

The city minted its own coins, some of which bear the image of the Asiatic divinity Men, who was worshipped at Antioch.

This name is retained on the city's coins down to the time of Claudius II, though in Ptolemy, the Synecdemus of Hierocles, and the Notitiae Dignitatum the name is recorded as Seleucia.

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