Nayar, Nayyar or Nair can refer to:
Groups of people:
- Naga People from North Eastern India
- The successors of Nāga tradition
- Nayar – a caste from the Southern Indian state of Kerala
- Nayar (Khatri) – a Khatri community from the Northern Indian state of Punjab
People:
- Abhishek Nayar – an Indian first-class cricketer
- Kunal Nayyar, an Indian-American actor, starring as Rajesh Koothrapalli in The Big Bang Theory
- O.P. Nayyar, an Indian film music director
- Sushila Nayyar, Mahatma Gandhi's personal secretary and physician
- Pyarelal Nayyar, her brother and Gandhi's other secretary
- A Nayyar, a Pakistani singer
- Ankur Nayyar, an Indian actor
- Anuj Nayyar, an Indian army officer
- Abdul Hameed Nayyar, a Pakistani nuclear physicist and activist
- Deepak Nayyar
- Nayyar Ali Dada
- Kuldip Nayar
- Shree K. Nayar
Other
- El Nayar – Mexican municipality
- Roman Catholic Territorial Prelature of Jesús María (del Nayar)
- Oren–Nayar Reflectance Model – Model in Physics