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| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 1943 | Confessions of a Vice Baron | Lucky Lombardi aka Count de Hoven / Van Hersten / Kilonis | ★★☆☆☆ |
| 1943 | You Can't Beat the Law | Rico | ★★★☆☆ |
| 1943 | La Dubarry era una dama | Flunky | ★★★☆☆ |
| 1942 | The Dawn Express | Otto | ★★☆☆☆ |
| 1942 | Bowery at Midnight | Jeweler (uncredited) | ★★★☆☆ |
| 1942 | The Panther's Claw | John Martin George (as William Castello) | ★★★☆☆ |
| 1941 | Road to Happiness | Party Guest (uncredited) | ★★★☆☆ |
| 1941 | You're Out of Luck | Johnny Burke | ★★★☆☆ |
| 1940 | Mad Youth | Count DeHoven | ★★☆☆☆ |
| 1940 | Chasing Trouble | Kurt | ★★★☆☆ |
| 1940 | Drums of the Desert | Addullah (as William Castello) | ★★★☆☆ |
| 1940 | Enviado Especial | Krug's Henchman at Windmill (uncredited) | ★★★★☆ |
| 1940 | Phantom of Chinatown | Jonas | ★★★☆☆ |
| 1940 | Mystery Sea Raider | Radio Operator | ★★☆☆☆ |
| 1940 | Hidden Enemy | Eric Bowman | ★★★☆☆ |
| 1939 | Balalaika | Capt. Testoff | ★★☆☆☆ |
| 1938 | Wanted by the Police | Russo | ★★★☆☆ |
| 1938 | Port of Missing Girls | Manuel | ☆☆☆☆☆ |
| 1938 | Race Suicide | Rudolf von Hertsen | ★★★☆☆ |
| 1938 | The Wages of Sin | Tony Kilonis | ★☆☆☆☆ |
| 1937 | Heroes of the Alamo | General Cos | ★★★☆☆ |
| 1937 | Young Dynamite | Flash Slavin | ★☆☆☆☆ |
| 1937 | Smashing the Vice Trust | James 'Lucky' Lombardi | ☆☆☆☆☆ |
| 1936 | Special Agent K-7 | Eddie Geller | ★★☆☆☆ |
| 1935 | Melody Trail | Gypsy Frantz | ★★☆☆☆ |
| 1935 | The Great Impersonation | Duval (uncredited) | ☆☆☆☆☆ |
| 1935 | 3 Kids and a Queen | Gangster | ★★★☆☆ |
| 1934 | De Jantjes | Dries | ★★★☆☆ |
| 1932 | Le Chant du marin | ☆☆☆☆☆ | |
| 1929 | Border Romance | Lieutenant of Rurales | ★★★☆☆ |
| 1927 | El rey de reyes | Babylonian Noble | ★★★☆☆ |
Películas destacadas de Willy Castello
Estas son las películas más destacadas en las que ha trabajdo:
