King Charles III is a 2014 play in blank verse by Mike Bartlett that premiered at the Almeida Theatre in London. The play is a fictional account of the accession and reign of King Charles III of the United Kingdom, and the limiting of the freedom of the press after the News International phone hacking scandal.

The Almeida Theatre, opened in 1980, is a 325-seat producing house with an international reputation, which takes its name from the street on which it is located, off Upper Street, in the London Borough of Islington. The theatre produces a diverse range of drama. Successful plays are often transferred to West End theatres.