Elissonas (Greek Ελλισών ή Ελισσώνας) is a river in Greece, in the central part of the Peloponnese peninsula, in Arcadia, the right tributary of the Alfeios.
It takes its source on the western slopes of the Menalon Mountains, northwest of Tripolis.
Pausanias reports that the river takes its source from the city of the same name[2] (near the modern village of Alonistena), founded by Helisson, the son of Lycaon (king of Arcadia).
From the son of Lycaon, the city and the river were named.
Above the gorge between the villages of Arakhamites and Vangos there is a stone bridge of the 19th century.