PES may refer to:
- Packetized elementary stream, part of the MPEG communication protocol
- Party of European Socialists, a pan-European political party
- Passenger Environment Survey, quality-control system for transit systems
- Payment for ecosystem services
- People's Education Society Institute of Technology
- Performance Enhancement Specialist, Issued by National Academy of Sports Medicine
- Pes anserine bursitis, inflammatory of the inner knee at the bursa of the pes anserinus
- PES (director), film director and animator
- Photoemission spectroscopy, a measurement of a substance's binding energy using the photoelectric effect
- Polyester, an artificially produced organic chemical that is spun and woven to make fabric
- Polyethersulfone, a thermoplastic polymer
- Potential energy surface, in physics and chemistry
- Power Engineering Society, the oldest society of the Institute of Electrical and Electronics Engineers (IEEE) focused on the scientific and engineering knowledge about electric power and energy
- Premier Election Solutions, formerly Diebold Election Systems
- Price elasticity of supply in Economics
- Pro Evolution Soccer (series), a multi-platform video game
- Programmed electrical stimulation, a type of electrophysiologic study
- Providence Elementary School, an elementary school in Chesterfield County, VA
- Proposed Encryption Standard
- Psychiatric Emergency Services
- PULHHEEMS, a system of grading physical and mental fitness used by Britain's armed forces
Pes may refer to:
- Pes (zoology), Latin for "foot" (body part), thus used in anatomy to mean "foot" (or analogous body part)
- Pes (unit), a Roman unit of length measurement roughly corresponding with a foot
- Pes (village), a former urban-type settlement in Novgorod Oblast, Russia; since 1999—a village