•
Dennis Price as Lieutenant Dennis Price ("
Number One") (Series 1, 4) •
Leslie Phillips as Sub-Lieutenant Leslie Phillips (Series 1-15),
Captain McDoom (Series 13-14) •
Jon Pertwee as
Chief Petty Officer "Jonsy" Pertwee (Series 1-15),
Commander Ambrose Weatherby (Series 8-15),
Vice-Admiral Buttenshaw (Series 10-12), Vice-Admiral "Burbly" Burwasher (Series 12-15), The Master (Series 13-14) •
Stephen Murray as
Lieutenant/
Lieutenant Commander Stephen Murray ("Number One") (Series 2-15), Lord Quirk (Series 12-13) •
Richard Caldicot as
Commander/
Captain Henry Povey (Series 1-15) •
Ronnie Barker as
Able Seaman "Fatso" Johnson (Series 1-9), Lieutenant Commander/Commander Archibald Stanton (Series 1-7), Intelligence (Series 2-9), Harold Golfball (Series 3-7, 9), Mr. Merrivale (Series 3-4, 6-9), Commander Bell (Series 5-9), Lieutenant Queeg (Series 6-9), Captain Hardcastle (Series 8-9) •
Heather Chasen as
WREN Heather Chasen (Series 1-4, 6-15), Mrs. Ramona Povey (Series 2-4, 6-15), Lady Amelia Todhunter-Brown (Series 2-4, 6-8, 10, 12-14), Second Officer Jean Maclootie (Series 9), Rita Murray (née Ffont-Bittocks) (Series 11-15), Myrtle Pertwee (Series 11-13, 15), WREN Simpkins (Series 12-13) •
Tenniel Evans as Able Seaman/
Leading Seaman Taffy Goldstein (Series 1-15), Ebenezer "Nunkie" Pertwee (Series 1-15), the
Admiral (Series 1-6), Sir Willoughby Todhunter-Brown (Series 2-4, 6-14),
Admiral Ffont-Bittocks (Series 7-15), Lieutenant Deacon (Series 12-14) •
Michael Bates as Commander Shaw (Series 1), Able Seaman Ginger (Series 1-7, 9-12, 14), Commander Bracewell (Series 2-6, 8-13), Mad Pierre (Series 2, 13-14), Lieutenant Bates (Series 3-7, 10), Samuel Pepys Washington-Burt (Series 3-7, 9),
Rear Admiral Ironbridge (Series 4-6, 9-14), the
Padre (Series 6-15), Flag Lieutenant Claude Dingle (Series 7-12), Captain Ignatius Aloysius Atcheson (Series 8-15), Lieutenant Birkett (Series 12-14), Vice Admiral Prout (Series 13-15) •
Judy Cornwell as WREN Judy Cornwell (Series 4) •
Janet Brown as WREN Vera Timkins (Series 5) •
Lawrie Wyman as Able Seaman Tiddy (Series 6, 10-11), Intelligence (Series 10-13), various •
April Walker as WREN Samantha Barrett (Series 15). April had been contracted to appear as the new companion to Jon Pertwee in
Doctor Who but was replaced before filming began after Pertwee objected. Guests: • Pamela Buck as Joyce ("Operation Fag End") •
Derek Francis as Sir Jeremy Crighton-Buller ("Pertwee and the Tratvian Beer") • Gretta Gouriet as Helen ("Helen, The New Wren") • Nigel Graham as Able Seaman Simpson ("The Smugglers Return"), Leading Seaman Harper ("The Anti-Submarine Missile"), and Clarence ("Sub-Conductor Phillips") •
Miriam Margolyes as Gloria ("The Island Swordfish") •
Elizabeth Morgan as
Mary Wilson ("Harold Wilson Reviews the Fleet"), the miniskirted spy ("The Relief of the Weather Ship"), Pussy Abundance ("The Tonipouhaha Treasure"), and Lady Fabia ("Povey — An Admiral at Last") • Amanda Murray (Stephen Murray's daughter) as WREN Amanda Murray ("Confirming Povey's Rank"), Fenella Star ("A Filthy Ferryboat"), WREN Amanda Martin ("Jigsaws and Jemmies"), and Mandy ("The Portsmouth Kiosk") •
Chic Murray as Lieutenant Queeg ("The Digital Isles Go Unstable" and "Egbert Hitches a Ride") •
Pete Murray as himself ("The Case of the HGM Mark 5") • Alan Reeve-Jones as Commander Trotter ("Commander Trotter Takes Charge" and "The South Kawowan Summit"), Herr Kapitan Hans ("Captain Povey Takes Over"), and
Harold Wilson ("Harold Wilson Reviews the Fleet") •
Norma Ronald as WREN Veronica Penfold ("The Mysterious Radio Signals"), Miss Belinda Bottomley ("Operation Cowes Barge"), and Maisie Clinger ("Number One's Anniversary") •
Frank Thornton as Henry Pettigrew ("Pertwee and the Tratvian Beer") and CPO Nathaniel Pertwee ("The Phenomenal Pertwee Tug") • June Tobin as Maisie ("A Crisp Romance") and Charlotte Stanton ("Families' Day") •
Jan Waters as WREN Jan Waters ("Taking Some Liberties" and "Smugglers in the Solent") •
June Whitfield as Freda ("The TV Documentary"), Madam Elvira Pertwee ("Hypnotising Ramona"), and the Mistress ("Captain Povey's Wig" and "The Talpinium Shell") ==Background==