"The Loner" is a song by Neil Young, his first solo single. It was released on his solo debut album in November 1968, and then an edited version as his debut solo single three months later on Reprise Records. It missed the Billboard Hot 100 chart completely, but over time has become a staple of his performance repertoire. Both it and "Sugar Mountain", its B-side recorded live at the Canterbury House in Ann Arbor, Michigan, were released on album together for his 1977 compilation, Decade.

"The Loner" was written while Buffalo Springfield was in its last throes. The widely held assumption that the song was written about Stephen Stills (who covered the song on his 1976 album Illegal Stills) can perhaps not be disproved (Young himself rarely provides clarity on such issues), but it is perhaps more likely that the song is autobiographical in nature, especially since Young was, of all Springfield members, the most bothered by playing as a member of a band.

Recorded with former Springfield member Jim Messina (bass) and George Grantham (drums) (they were uncredited on the album sleeve), it is the first Young track produced by David Briggs, with whom Young would collaborate until Briggs's death. Strings were arranged by David Blumberg, whom Young met through Briggs. Young's guitar is in Double drop D tuning; "psycho guitar noises" were made, according to Briggs, by putting the guitar through a Leslie speaker (the sound has also been referred to as a "fuzztoned rave-up"). The lyrics are characterized by dread and disorientation, coming from an "immobile protagonist" who "witnesses extraordinary visual displays".

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