Clontarf may refer to:
- Placenames
- Clontarf, Dublin, Ireland
- Clontarf, New South Wales, Australia
- Clontarf, Queensland, Australia
- Clontarf, Minnesota, United States
- Other
- Battle of Clontarf, 1014
- The Clontarf (Ship), New Zealand immigration ship of 1858-60
- Clontarf (whiskey), an Irish brand
- Clontarf Foundation, an Australian non-profit educational foundation for indigenous students.
- Clontarf Aboriginal College, the current name of a former orphanage in the Perth suburb of Waterford in Western Australia.