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.

His first feature film was the 2012 film I Belong, which won Amanda Awards in 2013 for Best Film, Best Script, Best Director and Best Actress (Laila Goody). In 2014 he directed the medium-length film I'm the One You Want (Det er meg du vil ha [no]). In 2019 he directed the film Beware of Children (original title Barn), and also wrote the script for the film. His 2020 film The Light from the Chocolate Factory (Lyset fra sjokoladefabrikken) treated relations between girlfriends. In 2024, he directed Sex, the first instalment in the new "Sex Dreams Love" trilogy, which was selected in the Panorama section at the 74th Berlin International Film Festival. Love, the trilogy's second instalment, was selected to compete for the Golden Lion at the 81st Venice International Film Festival. He was awarded the 2024 Nordic Council Film Prize for the film Sex. He directed the third instalment of the trilogy, Dreams (Sex Love), which had its international premiere in February 2025 at the 75th Berlin International Film Festival, where the film won the Golden Bear. This was the first time a Norwegian film won the Golden Bear