Heresy is a comedy talk show on BBC Radio 4, created and originally hosted by David Baddiel, now hosted by Victoria Coren Mitchell. In the show, the presenter and a panel of guests commit "heresy" by challenging people's most deeply received opinions on a subject, in front of a studio audience. The pilot and first series had four guests on each episode, but this has since been reduced to three. In the fifth series, Coren Mitchell replaced Baddiel as host.