Cadusii

300px|thumb|right|Map depicting the Achaemenid Empire in BC, by [[William Robert Shepherd (1923). The Cadusii are shown in the northern part of the empire.]] The Cadusii (also called Cadusians; , Kadoúsioi; Latin: Cadusii, Arabic:Qādūsīān) were an ancient Iranian tribe that lived in the mountains between Media and the shore of the Caspian Sea, an area bordering that of the Anariacae and Albani. The Dareitai and Pantimati people may have been part of the Cadusii.

According to tradition, the legendary Assyrian king Ninus subdued the Cadusii. The Greek physician and historian Ctesias () was highly interested in the Cadusii, incorporating them in his invented history of an early Median dynasty. The Cadusii later voluntarily submitted to Cyrus the Great (), the first ruler of the Achaemenid Empire (550–330 BC). According to Xenophon, as Cyrus was about to pass away, he appointed his younger son Tanaoxares (Bardiya) as satrap over the Medes, Armenians, and Cadusii.