PIK can mean:
- Payment in kind (disambiguation)
- Islamic Party of Kurdistan (PIK)
- Glasgow Prestwick International Airport, IATA airport code
- Polyteknikkojen Ilmailukerho, the flying club of Helsinki University of Technology
- the series of sail and motor airplanes developed by the club, including the Eiri-Avion PIK-20
- Potsdam Institute for Climate Impact Research, a research institute in Potsdam, Germany