Thelma Holt CBE (born 4 January 1932) is a British theatre producer and former actress. After a successful career as an actress, in partnership with Charles Marowitz, Thelma founded the Open Space Theatre in Tottenham Court Road, London, which became the forerunner of the London fringe. In 1977, joined The Round House in Chalk Farm as Artistic and Executive Director. There she instigated a policy of bringing the best of regional theatre to London: Citizens Theatre (Glasgow), Royal Exchange Theatre Company (Manchester), Stephen Joseph Theatre Company, Scarborough.