Sir Denys Louis Lasdun, CH, CBE, RA was an eminent English architect, the son of Nathan Lasdun (1879–1920) and Julie. Probably his best known work is the Royal National Theatre, on London's South Bank of the Thames, which is a Grade II* listed building and one of the most notable examples of Brutalist design in the United Kingdom.

The Royal National Theatre of Great Britain, commonly known as the National Theatre (NT) within the UK and as the National Theatre of Great Britain internationally, is a performing arts venue and associated theatre company located in London, England. The theatre was founded by the actor Laurence Olivier in 1963, and many well-known actors have performed with it since.