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Richard O'Sullivan (born 7 May 1944) is an English comedy actor. He is known for his role as Robin Tripp in the TV sitcoms Man About the House (1973–1976) and Robin's Nest (1977–1981) and as the title character in the period adventure series Dick Turpin (1979–1982). He also starred in Doctor at Large (1971), Doctor in Charge (1972–1973), Alcock and Gander (1972), Me and My Girl (1984–1988) and Trouble In Mind (1991).
| Year | Title | Role | Notes |
| 1953 | The Yellow Balloon | Boy Singing at Sunday School | uncredited |
| Malta Story | Ninno Gozar | ||
| 1954 | The Stranger's Hand | Roger Court | |
| 1954 | Dance Little Lady | Peter | |
| The Green Scarf | Child Jacques | ||
| Loves of Three Queens | Benoni | ||
| 1955 | The Dark Avenger | Thomas Holland | |
| Make Me an Offer | Charlie as a Boy | ||
| The Secret | John Martin | ||
| 1956 | Raiders of the River | Joey | |
| Jacqueline | Michael | ||
| It's Great to Be Young | Lawson | ||
| 1957 | No Time for Tears | William Reynolds | |
| Dangerous Exile | Louis XVII / Richard de Beauvais | ||
| 1959 | The Nun's Story | Pierre | uncredited |
| Carry On Teacher | Robin Stevens | ||
| Witness in the Dark | Don Theobald | ||
| 1960 | And Women Shall Weep | Godfrey Lumsden | |
| A Story of David | Abiathar | ||
| 1961 | Spare the Rod | Fred Harkness | |
| The Young Ones | Ernest | ||
| 1962 | The Prince and The Pauper | Hugo | |
| The Webster Boy | Jimmy Webster | ||
| 1963 | Cleopatra | Pharaoh Ptolemy XIII | |
| Dr. Syn, Alias the Scarecrow | George Ransley | ||
| 1964 | Wonderful Life | Edward | US title: Swingers' Paradise |
| Every Day's a Holiday | Jimmy Dainty | ||
| 1968 | A Dandy in Aspic | Nevil | |
| 1969 | The Haunted House of Horror | Peter | |
| 1970 | Futtocks End | The Boots | |
| 1972 | Au Pair Girls | Stephen | |
| 1973 | Father, Dear Father | Richard | |
| 1974 | Man About the House | Robin Tripp | |
| Can You Keep It Up for a Week? | Mr. Rose |
| Year | Title | Role |
| 1955 | Sherlock Holmes - The Case of the Unlucky Gambler | Andy Fenwick |
| 1956 | Colonel March of Scotland Yard | Roger |
| 1957 | Sword of Freedom | Alberto |
| 1960 | The Four Just Men - The Man with the Golden Touch | Pietro |
| 1966 | Danger Man | Aldo Shargis |
| 1967 | Great Expectations | Herbert Pocket |
| 1968 | The Ronnie Barker Playhouse | Arthur (episode 4, The Incredible Mr.Tanner) |
| 19711972–1973 | Doctor at LargeDoctor in Charge | Lawrence Bingham |
| 1971–1973 | Now Look Here | Keith |
| 1972 | Alcock and Gander | Richard Gander |
| 1973–19761977–1981 | Man About the HouseRobin's Nest | Robin Tripp |
| 1979–1982 | Dick Turpin | Dick Turpin |
| 1984–1988 | Me and My Girl | Simon Harrap |
| 1988 | The Giftie | Paul |
| 1991 | Trouble in Mind | Adam Charlesworth |
| 1996 | Holed | Henry |
| 1997 | Light Lunch | Himself |