In Greek mythology, Olganos () was a river god and the son of Beres.
Olganos is the offspring of Beres and the brother of Mieza and Beroia. He is said to be the eponym of the river of the same name.
There is attestation of Olganos's cult in the Macedonian town of Mieza. An inscribed bust of Olganos (circa. 2nd century) was found at Kopanos / Emathia and is now on display at the Archaeological Museum in Veria, Greece.
Kallipolitis, B. (1952), "Buste d'Olganos, héros éponyme d'un fleuve macédonien", in Monuments et mémoires de la Fondation Eugène Piot, Vol. 46, pp. 85–91, 1952. Persée.