Abdagases I (Greek: Ἀβδαγάσης, epigraphically ΑΒΔΑΓΑΣΟΥ; Kharosthi: 𐨀𐨬𐨡𐨒𐨮 A-va-da-ga-ṣa, Avadagaṣa[1][2]) was an Indo-Parthian king, who ruled Gandhara and possibly over most of the Indus region from c. 46 to 60 AD.

He was a nephew and successor of Gondophares, who had laid foundations for the Indo-Parthian kingdom after revolting against his Arsacid overlords in c. 19 AD.

[1] Abdagases belonged to the House of Suren, [citation needed] a prominent and influential family within the Arsacid Empire.

[6] Some of the Parthian magnates, however, were supporters of Artabanus II, due to their concern that Abdagases would become the de facto ruler of the Arsacid Empire, with Tiridates as a figurehead.

[6] The identification of the two Abdagases figures, although supported by some scholars, nevertheless still remains indecisive, due to the lack of numismatic evidence.