Colonel Bélisaire Beresford is a lead character in several French language film adaptations of Agatha Christie directed by Pascal Thomas. Bélisaire Beresford is portrayed by André Dussollier.
Bélisaire is modelled after the original Christie character Tommy Beresford, or at least the retirement age Tommy in By the Pricking of My Thumbs, but he has a different backstory. Unlike Tommy, who is outside of the establishment, Bélisaire is ex-military and a former head of the secret service. But like Tommy, he is phlegmatic and practical, always thorough and concerned with facts. Both have wives who think they lack imagination. Bélisaire is more reluctant than Tommy in getting involved in his wife's adventures and a recurrent theme, at least in the first two films, is how he always ends up being dragged unwillingly into investigating a case by his wife who is also named Prudence. His wife always comes up with ideas and solutions to problems but there are moments when Bélisaire's slow and steady methods win through.