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| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 1941 | Así acaba nuestra noche | Professor Meyer | ★★★☆☆ |
| 1941 | Among the Living | Minister | ★★★☆☆ |
| 1940 | The Earl of Chicago | Coroner (uncredited) | ★★★☆☆ |
| 1940 | La dama en cuestión | Mr. Marinier (uncredited) | ★★★☆☆ |
| 1939 | Lo que el viento se llevó | Minister (uncredited) | ★★★★☆ |
| 1938 | Man-Proof | Minister | ★★☆☆☆ |
| 1938 | Cuatro hombres y una plegaria | Prosecuting Attorney | ★★★☆☆ |
| 1938 | A Criminal Is Born | Judge Charles Edwin Marshall (uncredited) | ★★★☆☆ |
| 1937 | Abogado criminal | District Attorney Hopkins | ★★★☆☆ |
| 1937 | Capitanes intrépidos | Elliott (uncredited) | ★★★★☆ |
| 1937 | Miguel Strogoff | Grand Duke | ★★★☆☆ |
| 1937 | Cena de medianoche | ★★★☆☆ | |
| 1936 | El último mohicano | General Montcalm | ★★★☆☆ |
| 1936 | Stowaway | Alfred Kruikshank | ★★★☆☆ |
| 1936 | Pennies from Heaven | Clarence B. Carmichael | ★★★☆☆ |
| 1936 | María Estuardo | Ruthven | ★★★☆☆ |
| 1936 | Una mujer difamada | Editor (uncredited) | ★★★★☆ |
| 1936 | La esposa de su hermano | Winters | ★★★☆☆ |
| 1935 | College Scandal | Dr. Henri Fresnel | ★★★☆☆ |
| 1935 | The Perfect Gentleman | Sir Percy Phillips (uncredited) | ★★☆☆☆ |
| 1935 | The Winning Ticket | Jeffries | ★★☆☆☆ |
| 1935 | La tragedia de la Bounty | Judge Advocate (uncredited) | ★★★★☆ |
| 1935 | La feria de la vanidad | Pitt Crawley | ★★★☆☆ |
| 1935 | I've Been Around | Doctor | ★☆☆☆☆ |
| 1934 | Un amor prohibido | Commandant | ★★★★★ |
| 1934 | Encadenada | James (uncredited) | ★★★☆☆ |
| 1934 | What Every Woman Knows | Tenterden, Sybil's Brother (uncredited) | ★★★★☆ |
| 1934 | El enemigo público número 1 | Judge (uncredited) | ★★★☆☆ |
| 1934 | Hell in the Heavens | Capt. Andre De Laage | ★★☆☆☆ |
| 1933 | Parachute Jumper | Maitre D' (uncredited) | ★★★☆☆ |
| 1933 | Charlie Chan's Greatest Case | James Eagan | ☆☆☆☆☆ |
| 1933 | Asesinato en la terraza | Rutherford (uncredited) | ★★★☆☆ |
| 1932 | El asesino de Mr. Medland | A Doctor | ★★★☆☆ |
| 1931 | Son of India | Polo Club President (uncredited) | ★★★☆☆ |
| 1930 | Sarah and Son | Cyril Belloc | ★★★☆☆ |
| 1930 | The Right to Love | Dr. Fowler | ★★★☆☆ |
| 1930 | Romance | Gossiping Party Guest (uncredited) | ★★★☆☆ |
Películas destacadas de William Stack
Estas son las películas más destacadas en las que ha trabajdo:
