The Ogun River (Yoruba: Odò Ògùn) is a waterway in Nigeria that discharges into the Lagos Lagoon.

[5] The river is crossed by the Ikere Gorge Dam in the Iseyin local government area of Oyo State.

It also serves as a drain for mostly organic wastes from abattoirs located along the river's course.

The catechist Charles Phillips, father of the Charles Phillips who later became Bishop of Ondo, wrote in 1857 that the Ogun River was generally worshipped by the people who live along its banks from its rise until where it empties into the lagoon.

[11] At one time, the river formed an important route for traders carrying goods by canoe between Abeokuta and the Lagos Colony.