Colossal Youth (Portuguese: Juventude em Marcha, literally "Youth on the March") is a 2006 docufiction feature film directed by Portuguese director Pedro Costa. It was third feature by Costa set in Lisbon's Fontainhas neighborhood (after Ossos and In Vanda's Room), and the first to feature the recurring character Ventura.

Colossal Youth was shot on DV in long, static takes; it also mixes documentary and fiction storytelling. The film is a meditation on the aftermath of the Carnation Revolution and its consequences for Portugal's poverty-stricken Cape Verdean immigrants. It was part of the Official Competition at the 2006 Cannes Film Festival.