Jack Duffy
- Compleanno:
- 09/04/1882
- Luogo di nascita:
- Pawtucket, Rhode Island, USA:
 | Hostage for a Day (1994) SWAT #3 |
 | Love Takes Flight (1937) Bartender |
 | The Gold Racket (1937) Hinkle |
 | Wild Brian Kent (1936) Old-time fireman |
 | Pirate Party on Catalina Isle (1935) Old Pirate |
 | Texas Terror (1935) Jake Abernathy |
 | She Couldn't Take It (1935) Farmer |
 | Keystone Hotel (1935) Man with Ear Trumpet |
 | Here Comes Cookie (1935) Wilbur |
 | Pop Goes the Easel (1935) Bearded Man (uncredited) |
 | The Dancing Millionaire (1934) Dancing Academy Customer |
| | Boys Will Be Boys (1932) 'Grandpa' |
 | Hollywood on Parade No. A-1 (1932) Self |
| | Doctor's Orders (1932) |
 | Love in High Gear (1932) Hotel Proprietor |
| | The Freshman's Finish (1931) |
 | Sally (1930) Roue |
 | Divorce Made Easy (1929) Uncle Todd |
| | A Wireless Lizzie (1929) Grandpa Abner |
| | Are Scotchmen Tight (1929) Sandy MacDuff |
 | Loose Change (1928) Sandy MacDuff |
| | Say Uncle (1928) |
 | Love's Young Scream (1928) The Mayor |
 | Harold Teen (1928) Grandpop Teen |
| | Long Hose (1928) |
| | Nifty Nags (1927) |
| | Chicken Feathers (1927) Old Charley Kale |
| | Mister Wife (1926) His Neighbor |
| | Hitchin' Up (1926) Grandpa |
 | Ella Cinders (1926) Fire Chief |
 | Weak, But Willing (1926) Nanny's Father |
 | Madame Behave (1925) M.T. House |
 | A Rarin’ Romeo (1925) |
| | Reckless Romance (1924) Grandpa |
 | The Brass Bowl (1924) O'Hagan |
 | Court Plaster (1924) |
 | Grandpa's Girl (1924) |
 | Our Hospitality (1923) Sam Gardner (uncredited) |
| | Jungle Pals (1923) |
 | No Vacancies (1923) An Old Goat |
 | 365 Days (1922) Grandpa |
 | Fresh Air (1921) John Henry |
 | The Bakery (1921) Bit Part (uncredited) |
 | Neighbors (1920) The Judge (uncredited) |
 | The Stage Hand (1920) The Hero |
 | School Days (1920) School Board Chairman |
 | The Grocery Clerk (1919) Old geezer / Hick |
 | Blackie's Redemption (1919) The Dove |
 | A Dog's Life (1918) Man in Dance Hall (uncredited) |