The Serdini (Greek: Σερδινή) is a small river of western Achaea, Greece.

[1] It is a left tributary of the Peiros near Kato Alissos.

It rises near the village of Flokas and flows generally north along the villages Arla, Ano Soudenaiika, Avgeraiika, Agios Nikolaos and Lousika.

It empties into the Peiros south of Kato Alissos.

In the fertile valley of the Serdini river, several artifacts from the Mycenaean period have been excavated, including a cemetery near Spaliaraiika.