Jonathan Sayer is a British actor and playwright. He co-founded Mischief Theatre, responsible for The Play That Goes Wrong, Peter Pan Goes Wrong, The Comedy About a Bank Robbery, Groan Ups, Magic Goes Wrong and The Goes Wrong Show.

Mischief Theatre is a British theatre company that was founded in 2008 by a group of students from the London Academy of Music and Dramatic Art in West London, and directed by Henry Lewis, Jonathan Sayer, and Henry Shields. The group originally began by doing improvised comedy shows, but by 2012, they expanded into comedic theatrical performances that include choreographed routines, jokes, and stunts.