Sian Phillips, Matt Rawle and Harriet Thorpe are to join the previously announced Will Young and Michelle Ryan in Cabaret.
Phillips, best known for film and TV work such as I, Claudius and Goodnight Mr Chips, will play Fraulein Schneider.
Rawle, who most recently appeared in Pippin at the Menier Chocolate Factory and who played Che in the 2006 West End production of Evita, will take the role of Cliff.
Thorpe, who was recently in Crazy for You in the West End and who appeared in the long-running TV series The Brittas Empire, will play Fraulein Kost.
Cabaret, by John Kander and Fred Ebb, is directed by Rufus Norris. It runs at the Savoy Theatre from October 3, with Ryan as Sally Bowles and Young as the Emcee.