The Luga (Russian: Луга) is a river in Novgorodsky and Batetsky Districts of Novgorod Oblast and Luzhsky, Volosovsky, Slantsevsky, and Kingiseppsky Districts of Leningrad Oblast of Russia.

The river flows south, crosses into Batetsky District, and gradually turns west.

A stretch of the Luga serves the border between Novgorod and Leningrad Oblasts.

In the town of Kingisepp the Luga turns north and subsequently northeast.

The drainage basin of the Luga includes large areas in the north of Novgorod Oblast (Novgorodsky and Batetsky Districts), as well as in the southwest of Leningrad Oblast (Gatchinsky, Luzhsky, Volosovsky, Slantsevsky, and Kingiseppsky Districts).