The Oskil or Oskol[1] (Ukrainian: Оскiл; Russian: Оскол) is a south-flowing river in Russia and Ukraine.

[2] The river has its sources on the Central Russian Upland, and flows through Kursk and Belgorod Oblasts in Russia, and through the eastern part of Kharkiv Oblast in Ukraine, where it joins the Seversky Donets river.

An artificial lake, the Oskil Reservoir, was created in 1958 to help with flood protection and as a source of electricity.

[citation needed] On March 31, 2022, during the Russian invasion of Ukraine, the Oskil Dam was destroyed.

[3] In September of 2022, to resist the 2022 Ukrainian Kharkiv counteroffensive, Russian forces unsuccessfully used the Oskil River as a defensive barrier.