The Neo River (根尾川 Neo-gawa) is a river in Japan which flows through Gifu Prefecture, and is part of the Kiso River system. North of Ōno, the river is also called the Yabu River (藪川 Yabu-kawa).
The river originates on Mount Nōgōhaku, which lies on the border of Gifu and Fukui prefectures. After starting in Motosu, the river flows into Ibigawa, where it merges with the Ibi River.
The river passes through or forms the boundary of Motosu, Ibigawa, Ōno, and Hozumi, all in Gifu Prefecture.