Chashtana (Greek: Ϲιαϲτανϲας Siastansas (epigraphic), Τιαστανης Tiastanēs; Brahmi: Ca-ṣṭa-na Caṣṭana; Kharosthi: 𐨖𐨛𐨞 Cha-ṭha-ṇa, Chaṭhaṇa) was a ruler of the Saka Western Satraps in northwestern India during 78-130 CE, when he was the satrap of Ujjain.