Jonathan Stuart Bailey (born April 25, 1988) is an English actor known for his dramatic, comedic, and musical roles on stage and screen. He is the recipient of a Laurence Olivier Award, a Critics' Choice Television Award, as well as a Primetime Emmy Award nomination.

Bailey began his career as a child actor in Royal Shakespeare Company productions, and by eight, he was performing as Gavroche in a West End production of Les Misérables. He has since starred in contemporary plays such as South Downs in 2012, The York Realist in 2018, and Cock in 2022; in classical plays like the Royal National Theatre's Othello in 2013 and Chichester Festival Theatre's King Lear in 2017; as well as in musicals, namely the London revival of The Last Five Years in 2016 and the West End gender-swapped revival of Company, for which he won the Laurence Olivier Award for Best Actor in a Supporting Role in a Musical in 2019.