A détournement (French: [detuʁnəmɑ̃]), meaning "rerouting, hijacking" in French, is a technique developed in the 1950s by the Letterist International, and later adapted by the Situationist International (SI), that was defined in the SI's inaugural 1958 journal as "[t]he integration of present or past artistic productions into a superior construction of a milieu. In this sense there can be no situationist painting or music, but only a situationist use of those means. In a more elementary sense, détournement within the old cultural spheres is a method of propaganda, a method which reveals the wearing out and loss of importance of those spheres."

It has been defined elsewhere as "turning expressions of the capitalist system and its media culture against itself"—as when slogans and logos are turned against their advertisers or the political status quo.

Détournement was prominently used to set up subversive political pranks, an influential tactic called situationist prank that was reprised by the punk movement in the late 1970s and inspired the culture jamming movement in the late 1980s.

Its opposite is recuperation, in which radical ideas or the social image of people who are viewed negatively are twisted, commodified, and absorbed in a more socially acceptable context.