The Liedas (or Leda) is a river of Kėdainiai district municipality, Kaunas County, central Lithuania.

It flows for 17.7 kilometres and has a basin area of 31.5 km².

It starts nearby Pelutava village and later flows through the Pernarava-Šaravai Forest.

It meets the Šušvė from the right side near Juodkaimiai village.

The hydronym Liedas possibly derives from Lithuanian verbs liedyti, lieti ('to water').