PEK may refer to:
- IATA code for Beijing Capital International Airport
- Polyetherketones, an engineering plastic
- Pomeranian Evangelical Church, a Protestant church in Mecklenburg-Western Pomerania, Germany
- Program for Evaluating Complementary Medicine, the English translation of Programme Evaluation Komplementärmedizin (PEK)
- Phantom Evil King, a boss in the video game Okage
