Periyar or Periyar may refer to :
- Periyar (river), in Kerala, India
- Periyar district, now Erode district, in Tamil Nadu, India
- Periyar National Park, in Kerala, India
- Mullaperiyar Dam, a dam in Idukki district, Kerala, India
- Vandiperiyar, a village in Idukki district, Kerala, India
- Periyar Dasan (1949–2013), an actor from Tamil Nadu, India
- Periyar E. V. Ramasamy (1879–1973), a Tamil social reformer
- Periyar Maniammai University, in Thanjavur, Tamil Nadu, India
- Periyar University, in Salem, Tamil Nadu, India
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