Robert Downey Jr. Sherlock Holmes Jude Law Dr. John Watson Rachel McAdams Irene Adler Mark Strong Lord Henry Blackwood Eddie Marsan Inspector Lestrade Robert Maillet Dredger Geraldine James Mrs. Hudson Kelly Reilly Mary Morstan William Houston Constable Clark Hans Matheson Lord Coward James Fox Sir Thomas Rotheram William Hope Ambassador Standish Clive Russell Captain Tanner Oran Gurel Reordan David Garrick McMurdo Ky Discala Maid Andrew Brooke Guard Captain Tom Watt Carriage Driver John Kearney Carriage Driver Sebastian Abineri Coach Driver Jonathan Gabriel Robbins Guard James A. Stephens Captain Philips Terence Taplin Groundskeeper Bronagh Gallagher Palm Reader Joe Egan Big Man Jefferson Hall Young Guard Miles Jupp Waiter Marn Davies Police Officer Andrew Greenough Prison Guard Ned Dennehy Man with Roses Martin Ewens Removable Man James Greene Governor David Emmings Grave Policeman Ben Cartwright Grave Policeman