Avvaiyar, Avviyar, or Auvaiyar is a Tamil title. It may refer to:
- Avvaiyar (Sangam poet), a 1st-century BCE poet
- Avvaiyar (8th-century poet), an 8th-century poet
- Avvaiyar (12th-century poet), a 12th-century poet
- Avvaiyar (film), a 1953 Indian film by Kothamangalam Subbu
- Avviyar (crater), a crater on Venus named for the Sangam period poet