The Okhta (Russian: Óхта) is a river in Vsevolozhsky District of Leningrad Oblast and the eastern part of the city of Saint Petersburg, Russia.

The Rzhevsky Reservoir (5 kilometres (3.1 mi) long, 120 metres (390 ft) wide, with a volume of 4 mln m³) has been built on the Okhta.

The source of the Okhta is in the swamps in the northwestern part of Vsevolozhsky District, north of the town of Sertolovo.

Downstream of the town of Murino it enters the city of Saint Petersburg, passes Ladozhsky railway station and has its mouth under the Malookhtinsky Bridge, which separates Malookhtinskaya and Sverdlovskaya Embankments.

The town of Vsevolozhsk and the urban-type settlements of Toksovo and Kuzmolovsky are located in this river basin.