The Josvainiai Forest (Lithuanian: Josvainių miškai) is a forest in Kėdainiai District Municipality, central Lithuania, located 6 kilometres (3.7 mi) to the west from Kėdainiai and 4 km to the north from Josvainiai.

The rivers Smilga, Smilgaitis and Tranys drain the forest (the Nevėžis basin).

[1] The fauna of the forest consists of wild boar, roe deer, red fox, raccoon dog, pine marten, as well as hazel grouses, black storks, Eurasian woodcocks, common buzzards, sparrowhawks, northern goshawk, owls.

During the Soviet era, a rocket base (now in ruins) was in the forest near Keleriškiai.

Barsukynė, Palainiškiai, Čiukiškiai and Stasiūnai, Grašva villages are inside the forest or on its edges.