The Unicorn Theatre is a children's theatre in the London Borough of Southwark, in England. It is a custom-built, RIBA Award–winning building on Tooley Street, which opened in 2005. The theatre was designed by Keith Williams, built by Arup and comprises two theatre spaces (the Weston and Clore Theatres), an education studio, rehearsal space, café and the John Lyon meeting room. The Unicorn is a registered charity and is an Arts Council England National Portfolio organisation.