"Ohio" is a protest song written and composed by Neil Young in reaction to the Kent State shootings of May 4, 1970, and performed by Crosby, Stills, Nash & Young. It was released as a single, backed with Stephen Stills's "Find the Cost of Freedom", peaking at number 14 on the US Billboard Hot 100.

Although a live version of the song was included on the group's 1971 double album Four Way Street, the studio versions of both songs did not appear on an LP until the group's compilation So Far was released in 1974. The song also appeared on the Neil Young compilation album Decade, released in 1977. The song also appears on Neil Young's Live at Massey Hall album, which he recorded in 1971 but did not release until 2007