Radnor may refer to various places:
- United Kingdom
- Radnorshire, a county of Wales until 1974, commonly known as Radnor
- Radnor (district), a district of Powys, Wales between 1974 and 1989
- New Radnor, a village in Powys, Wales
- Old Radnor, a town in Powys, Wales
- United States
- Radnor, Indiana
- Radnor Township, Peoria County, Illinois
- Radnor, Ohio
- Radnor Township, Delaware County, Ohio
- Radnor, Pennsylvania
- Radnor Township, Delaware County, Pennsylvania
- Radnor Lake State Natural Area, Nashville, Tennessee
Radnor may also refer to:
- Earl of Radnor, English peerage
- Josh Radnor (born 1974), American actor
- Hill Radnor, breed of domestic sheep
- Radnor, fictional character in the strategy game Dune II