Adyar may refer to:
- Adyar (Chennai), a locality in Chennai (Madras) in the state of Tamil Nadu, India
- Battle of Adyar, October 1776
- Adyar River, a river in Chennai city
- Adyar, Tamil Nadu, a town in the state of Tamil Nadu, India
- Adyar gate, another name of ITC Sheraton Park hotel & Towers in Chennai