Los Campesinos! are a seven-piece indie pop band from Cardiff, Wales, formed in early 2006 at Cardiff University. The band has seen several lineup changes– lead vocalist Gareth David Paisey and guitarists Neil Turner and Tom Bromley are the only remaining original members, now joined by guitarist Rob Taylor, keyboardist Kim Paisey, bassist Matt Fidler and drummer Jason Adelinia.

Influenced by the twee pop movement, the band released their debut studio album, Hold on Now, Youngster..., in February 2008, and followed up with We Are Beautiful, We Are Doomed, in October that year. Both receiving favourable reviews by critics, the former was described by Pitchfork as a "giddy, tuneful love note to individuality, pathos – and everything else indie pop built its name on". Their third album, Romance Is Boring (2010), saw the band expanding their "already sizeable instrumental palette". Since then, Los Campesinos! have issued four more studio albums, with All Hell (2024) being their most recent release.

In 2021, Pitchfork included Los Campesinos! among the 200 most important artists from the site's first 25 years, and described the group as "the 21st century's most endearing cult band."