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Ronald Adam averages 6.84 across 21 rated films as an actor, ahead of Anton Diffring at 6.43.
Dot size shows IMDb votes. Films with fewer than 1,000 votes sit on the baseline.
| Reach for the Sky | 1956 | 7.2 | Actor | Actor |
| The Man Who Could Cheat Death | 1959 | 6.3 | as Dr. Georges Bonnet | as Second Doctor |
| Zeppelin | 1971 | 6.1 | as Colonel Hirsch | Actor |