Dag Johan Haugerud (born 30 December 1964) is a Norwegian librarian, novelist, screenwriter and film director. His films include I Belong, which won Amanda Awards in 2013, Beware of Children, which won nine Amanda Awards in 2020, as well as the Nordic Council Film Prize, Sex, which was awarded the 2024 Nordic Council Film Prize, and Dreams (Sex Love), which won the Golden Bear in 2025 at the 75th Berlin International Film Festival.

His novels include Noe med natur (1999), Den som er veldig sterk, må også være veldig snill (2002), Hva jeg betyr (2011) and Enkle atonale stykker for barn (2016). He has created several short films, including Utukt from 2000 and Trøbbel from 2006.