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Ralph Thomas averages 6.32 across 11 rated films as a director, ahead of Joan Sims at 6.14 as an actor.
Dot size shows IMDb votes. Films with fewer than 1,000 votes sit on the baseline.
| Doctor in the House | 1954 | 6.6 | Director | Actor |
| Doctor at Sea | 1955 | 5.8 | Director | Actor |
| Upstairs and Downstairs | 1959 | · | Director | Actor |
| Doctor in Love | 1960 | · | Director | as Dawn |
| No, My Darling Daughter | 1961 | · | Director | as Second Typist |
| A Pair of Briefs | 1962 | · | Director | Actor |
| Carnaby, M.D. | 1966 | · | Director | as Matron Sweet |
| Doctor in Trouble | 1970 | · | Director | as Russian Captain |