"I Ain't Marching Any More" (sometimes titled "I Ain't Marchin' Anymore" or "I Ain't A-Marching Anymore") is an anti-war song by Phil Ochs, a U.S. protest singer from the 1960s known for being a passionate critic of the American military industrial complex. Originally released on his 1965 album of the same name, "I Ain't Marching Any More" is one of Ochs's best-known songs. According to one biographer, "I Ain't Marching Any More" "instantly became [Ochs'] signature song". Ochs performed it at concerts and rallies for the remainder of his career, almost always drawing cheers from the audience.