Once a Thief is a 1935 British, black-and-white, crime film directed by George Pearson and starring John Stuart as Roger Drummond.^[1] It was produced by British & Dominions Film Corporation and Paramount British Pictures.

The manager steals a chemist's paint formula while he is in gaol for gem theft.

• John Stuart as Roger Drummond
• Nancy Burne as Marion Ashley
• Lewis Shaw as Frank Ashley
• Derek Gorst as George Marston
• Frederick Culley as Sir John Chirwin
• Lola Duncan as Mrs. Eagle
• Joan Kemp-Welch as Alice
• Ronald Shiner as Man

• Once a Thief at IMDb
• Once a Thief at the British Film Institute^{[better source needed]}