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.

In 2008, Sayer, Henry Lewis, and Henry Shields co-founded Mischief Theatre while they were studying a drama foundation course at the London Academy of Music and Dramatic Art.^[1]

In 2012, Sayer co-wrote with Lewis and Shields The Play That Goes Wrong,^[2] which premiered later that year at The Old Red Lion, Islington.^[3] Sayer played Dennis Tyde in both the original London cast^[4] and the original Broadway cast.^[5] In 2013, another Lewis, Sayer and Shields production, Peter Pan Goes Wrong, premiered at The Pleasance Theatre.^[6] with Sayer amongst its original cast, playing Dennis.^[7]

In 2016, Lewis', Sayer's and Shields' play The Comedy About a Bank Robbery opened at the Criterion Theatre; Sayer was amongst its original cast, and played Warren Slax.^[8] In August 2019, Magic Goes Wrong, a play written by Lewis, Sayer, Shields, Penn and Teller, premiered at the Quays Theatre; Sayer played Mikey,^[9] and subsequently took him on tour.^[10][11] In September 2019, the next Lewis, Sayer and Shields play, Groan Ups, premiered at Vaudeville Theatre, as part of a projected year-long residency at the theatre (later curtailed due to COVID-19 restrictions^[12]),^[13] with Sayer playing Simon.^[14]

In 2016, a production of Peter Pan Goes Wrong was aired by BBC1, with Sayer playing Dennis.^[15] The following year, they aired A Christmas Carol Goes Wrong, with Sayer playing Dennis.^[16] BBC1 aired twelve episodes of The Goes Wrong Show^[17] between December 2019^[18] and November 2021.^[19]