Peo may refer to:

  • Reckong Peo, the capital of Kinnaur district in India

PEO may stand for:

  • Parking enforcement officer
  • Plasma electrolytic oxidation, a surface-treatment process for metals
  • Polyethylene oxide, a polymer
  • Old Persian language, per ISO 639-2 and ISO 639-3 standards
  • Pancyprian Federation of Labour, an umbrella organization for trade unions in Cyprus
  • P.E.O. Sisterhood, an international women's organization with headquarters in North America
  • Professional employer organization, a service provider of outsourced human resource management
  • Professional Engineers Ontario
  • Program Executive Officer, an individual, civilian or military, responsible for large scale U.S. military acquisitions
  • Progressive external ophthalmoplegia, a disease
  • Programs Evaluation Office, a U.S. Defense Department covert mission in Laos
  • Progressive External Ophthalmoplegia, a disease caused by mtDNA mutation