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| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 1955 | Los contrabandistas de Moonfleet | Jacob | ★★★☆☆ |
| 1954 | La gran noche de Casanova | Little Man | ★★★☆☆ |
| 1952 | El pirata Barbanegra | Gilly | ★★★☆☆ |
| 1949 | Master Minds | Hugo | ★★★☆☆ |
| 1948 | Rostro pálido | Pete | ★★★☆☆ |
| 1947 | Dick Tracy Meets Gruesome | X-Ray | ★★★☆☆ |
| 1946 | Terror en la noche | Sands - Moran's Accomplice | ★★★☆☆ |
| 1946 | Bedlam, hospital psiquiátrico | Varney (uncredited) | ★★★☆☆ |
| 1946 | Escándalo en París | Cousin Pierre | ★★★☆☆ |
| 1946 | Just Before Dawn | Louie (uncredited) | ★★★☆☆ |
| 1946 | Dick Tracy vs. Cueball | Rudolph | ★★★☆☆ |
| 1945 | La isla de la muerte | Andrew Robbins (uncredited) | ★★★☆☆ |
| 1945 | La mansión de Drácula | Steinmuhl | ★★★☆☆ |
| 1944 | La venganza del hombre invisible | Alf Perry, Cabman (uncredited) | ★★★☆☆ |
| 1944 | Jack, el destripador | Man with Cart | ★★★☆☆ |
| 1943 | El barco fantasma | Paolo 'Finn' Lindstrom, the Mute | ★★★☆☆ |
| 1943 | Headin' for God's Country | Jeff | ☆☆☆☆☆ |
| 1943 | Adorables estrellas | Pub Patron in Errol Flynn Number (uncredited) | ★★★☆☆ |
| 1940 | Diamond Frontier | Morgan | ☆☆☆☆☆ |
| 1939 | El espía negro | German Sailor looking for Capt. Hardt | ★★★☆☆ |
| 1939 | Torture Ship | Jesse Bixel | ★★☆☆☆ |
| 1938 | South Riding | Reg. Aythorne | ★★★☆☆ |
| 1937 | The High Command | Fazerack | ★★★☆☆ |
| 1936 | Everything Is Thunder | Young Man with Lantern | ★★★☆☆ |
| 1936 | Rembrandt | Undetermined Secondary Rôle (uncredited) | ★★★☆☆ |
Películas destacadas de Skelton Knaggs
Estas son las películas más destacadas en las que ha trabajdo:
