Leonard Daniel Andreas Terfelt, originally Jonson, born 20 August 1976 in Hägersten, is a Swedish actor.

Terfelt made his film debut in 2000 in Jalla! Jalla!. In 2007, he had the recurring role of Niillas Kimmel in the TV series Hook. The same year, he starred in the film Leo. He was nominated for a Guldbagge in 2008 for this role. In 2008-2009 he served the role of Roger Andersson in the TV series Innocently Convicted. In 2013 he played the role of Hans von Enke in five films about Kurt Wallander. In 2014, he starred in the film Flugparken against, among others, Sverrir Gudnason. He also appeared in The Bridge (the 2011 TV series) in the 4th and last season, as William (Leonora's father), in 2018.