Biografía no disponible
| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 1941 | El nacimiento del blues | Jeff as a Boy | ★★★☆☆ |
| 1939 | The Greener Hills | Miller Son | ★★★☆☆ |
| 1938 | The Marines Are Here | Tommy Foster | ☆☆☆☆☆ |
| 1937 | Una nación en marcha | Ramsay MacKay Jr. | ★★☆☆☆ |
| 1937 | Madame X | Peter Simonds | ★★★☆☆ |
| 1936 | Sutter's Gold | John Sutter Jr. - Age 8 | ☆☆☆☆☆ |
| 1936 | Boulder Dam | Peter Vangarick | ★★☆☆☆ |
| 1936 | Cuando volvamos a amarnos | Kit (as Ronald Cosbey) | ★★★☆☆ |
| 1935 | Public Opinion | Tommy Arnold | ☆☆☆☆☆ |
| 1935 | Personal Maid's Secret | Bobby Smith | ★★★☆☆ |
| 1935 | Nido de águilas | Mike - as a Boy | ★★★☆☆ |
| 1935 | Oil for the Lamps of China | Bunsy Wellman | ★★★★☆ |
| 1935 | Moonlight on the Prairie | Young Boy | ★★★☆☆ |
| 1935 | Vivo mi vida | Alvin (Uncredited) | ★★★☆☆ |
| 1935 | Shipmates Forever | Little Boy (uncredited) | ★★★☆☆ |
| 1934 | Little Men | Rob Bhaer | ★★☆☆☆ |
| 1934 | Now I'll Tell | Tommy Doran Jr. | ★★☆☆☆ |
| 1934 | Una mujer de su casa | Buddy Reynolds | ★★★★☆ |
| 1934 | The Circus Clown | Dickie Madison | ★★★☆☆ |
| 1934 | Registered Nurse | Dickie | ★★☆☆☆ |
| 1933 | Siempre en mi corazón | Teddy 'Sonny' Wilbrandt | ★★★☆☆ |
| 1933 | Broadway Bad | Big Fella | ★★★☆☆ |
| 1933 | King of the Jungle | Kaspa, aged 3 | ★★☆☆☆ |
| 1933 | Broadway Thru a Keyhole | Little Boy | ★★★☆☆ |
| 1933 | The Iron Master | Little Billy Stillman as a Small Child | ☆☆☆☆☆ |
| 1933 | Gloria y hambre | Young Bill Holmes (uncredited) | ★★★★☆ |
| 1933 | El diluvio | Ronny Webster | ★★★☆☆ |
| 1932 | The Man from Yesterday | Baby Tony | ★★☆☆☆ |
| 1931 | East Lynne | William as a Child | ★★★☆☆ |
| 1931 | Hush Money | Baby (uncredited) | ☆☆☆☆☆ |
| 1929 | Madame X | Boy at Puppet Show (uncredited) | ★★★☆☆ |
| Año | Título | Trabajo | Calificación |
|---|
| Año | Título | Personaje | Calificación |
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Películas destacadas de Ronnie Cosby
Estas son las películas más destacadas en las que ha trabajdo:
