A Man and His Sin (French: Un homme et son péché) is a Canadian drama film, directed by Paul Gury and released in 1949. Adapted from Claude-Henri Grignon's 1933 novel Un homme et son péché, the film stars Hector Charland as Séraphin Poudrier, the wealthy but miserly mayor of the village of Sainte-Adèle, Quebec, Nicole Germain as Donalda Laloge, a village resident who was given in marriage to Séraphin as payment for a family debt even though she is actually in love with her boyfriend Alexis Labranche (Guy Provost), and Ovila Légaré as the village priest Antoine Labelle.

However, the film did not replicate the plot of the original novel, in which Séraphin's miserliness led directly to Donalda's death; instead, it tells a story in which Séraphin loans Alexis $200 to buy a farm, but then uses his power to prevent Alexis from getting a job to repay him so that Alexis will remain indebted and under Séraphin's control.

The cast also included Henri Poitras, Suzanne Avon, Adjutor Bouré, Eugène Daigneault, Arthur Lefebvre, Armand Leguet, George Alexander, Juliette Béliveau, Julien Lippé, Lucien Martin, Camille Ducharme, Paul Guèvremont, Georges Toupin and Conrad Gauthier.

A sequel film, Séraphin, was released the following year with most of the same cast.