Steiria (Ancient Greek: Στείρια) was a deme of ancient Attica on the east coast, between Prasiae and Brauron, which belonged to the phyle of Pandionis. Stiris in Phocis is said to have been founded by the inhabitants of this deme. The road from Attica to Steiria and the harbour of Prasiae was called the Στειριακὴ ὁδός. Steiria, located west of Porto Rafti, was the deme of Theramenes and Thrasybulus.

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This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Attica". Dictionary of Greek and Roman Geography. London: John Murray.

37°53′53″N 24°00′39″E/37.898159°N 24.010734°E/ 37.898159; 24.010734