The Asopos (Greek: Ασωπός, referred to in Latin sources as Asopus) is a river in Boeotia and northern Attica, Greece.

[2][3] The Asopos flows along the following places, from the source downstream: Lefktra, Agios Thomas, Oinofyta, Sykamino, Skala Oropou.

[2] Pausanias (9.1.1) cites Plataean tradition that Asopus was ancient king of that region in succession to King Cithaeron who gave his name to the mountain as King Asopus gave his name to the river and that the city Plataea was named after Plataea daughter of the river Asopus.

Finally Antiope mother of Amphion and Zethus by Zeus is sometimes a daughter of Asopus.

Statius's Thebaid tells of the warrior Hypseus, mortal son of Asopus, who leads the men of Alalcomene, Itone, Midea, Arne, Aulida, Graea, Plataea, Pleteon, and Anthedon.