Fredrik Hallgren is a Swedish actor and writer. Born in Stockholm on 7 December 1973, he studied at Calle Flygare Teaterskola between 1996-1998 and at the Scene Studio in Stockholm from 2001 to 2003.

Frederik's first role on the screen was in Varannan vecka (2006) in 2006, in which he played Håkan. A number of television roles have followed, including playing Frans Ytterman in 112 Aina (2013) between 2013 & 2015, and playing a number of various characters in Partaj (2011), a series featuring parodies of Swedish and American shows and movies, as well as imitations of various celebrities.

In 2016 Frederik portrayed the character Bob Lundin in the series Vårdgården (2016), before, in 2017, taking on the role of Martin in Bonusfamiljen (2017), a drama series exploring the complexities of relationships in modern family life.