Pia or Piá may refer to:
- Pia, Polynesian arrowroot
- Pia (band), a Korean rock band
- Pia Carry, a lifesaving technique
- Pia (name), a given name
- Pia, France, a French commune
- Pia, Iran, a village in Razavi Khorasan Province, Iran
- Pia mater, a layer of the meninges in the brain
- Piá (footballer born 1982), full name João Batista Inácio, a Brazilian football player
- Piá (footballer born 1973), a Brazilian football player
- Pia Toscano, a finalist on the tenth season of American Idol
- 614 Pia, a minor planet orbiting the Sun
- Pakistan International Airlines, the flag carrier of Pakistan
- PIA is the IATA code for the General Wayne A. Downing Peoria International Airport in Peoria, Illinois.