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| Native name | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Born | 1920 Tynagh, County Galway, Ireland | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Died | July 2005 (aged 84–85) Portlaoise, County Laois, Ireland | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Sport | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Sport | Hurling | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Position | Left wing-forward | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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John Killeen (1920 – June 2005) was an Irish hurler who played as a left wing-forward for the Galway senior team.
Killeen made his first appearance for the team during the 1944 championship and was a regular member of the starting fifteen until his retirement a decade later after the 1954 championship. During that time he won a National Hurling League winners' medal.
At club level Duffy began his club career with Tynagh in Galway before later winning two county club championship medals with Clonad in Laois.