The Acorn is the collaborative music project of Honduran-Canadian musician/songwriter Rolf-Carlos Klausener.

Formed as a vehicle for Klausener's early improvisations and interests in regionalism, his songs mine the human condition, exploring family, kinship, and the permutations of the heart. The Acorn’s releases have run the gamut from American primitive guitar and psych-folk, to art pop, balladry, and minimal electro. At its core lies Klausener's vivid and emotive songwriting. The project takes its name from Klausener's family shield which bears three acorns.

Emerging from Ottawa's underground in 2004, The Acorn has released five full-length albums, multiple EPs, and has headlined tours worldwide, as well as supporting artists like Bon Iver, Calexico, Fleet Foxes, and Elbow.

Both their critically-acclaimed 2007 album, Glory Hope Mountain, and 2015's Vieux Loup were long-listed for Canada's Polaris Music Prize.