Magnus Lennarth Betnér (born 16 August 1974 in Stockholm) is a Swedish comedian, social critic and television host.

In August 2010 Betnér performed a complete run of hour-length shows in English at The Stand Comedy Club during the Edinburgh Festival Fringe, receiving praise in mostly four star reviews.

Betnér uses dark comedy, often offensively, against Swedish celebrities such as Linda Rosing, Ebba von Sydow, Mikael Persbrandt, Per Gessle and many more.

His stand-up comedy has garnered him much criticism and even death threats from Swedish neo-Nazis and rappers, but he finds it humorous that people can get so angry about jokes.

Betnér has also released four DVD movies: Live från Norra Brunn (Live from Norra Brunn), Magnus Betnér UnCut, Inget är heligt (Nothing is sacred) and Tal till nationen (Speech to the nation).

In the autumn of 2008, Betnér's own TV program I ditt ansikte (In your face) was broadcast on Channel 5 in Sweden.