The Izhora (Russian: Ижора, Finnish: Inkereenjoki), also known as the Inger, is a left tributary of the Neva on its run through Ingria in northwestern Russia from Lake Ladoga to the Gulf of Finland.

The river is noted as the farthest Swedish forces ever reached between the Viking Age and the Time of Troubles.

The river has a sustainable underground water supply in both summer and winter, never drying up or freezing through.

In Kolpino, the Izhora enters the federal city of Saint Petersburg.

The drainage basin of the Izhora includes the northern parts of Gatchinsky and Tosnensky Districts, as well as some areas within Saint Petersburg.