The Aknysta is a river in Anykščiai district municipality, Utena County, in northeastern Lithuania.

It flows for 18.2 kilometres and has a basin area of 94.2 km².

The villages Aknystos and Aknysčiai are situated along the river.

[2] The hydronym Aknysta possibly derives from Lithuanian: akis 'eye, waterhole, ice-hole'.

This article related to a river in Lithuania is a stub.