PEO

• Reckong Peo, the capital of Kinnaur district in India

As an acronym, PEO may refer to:

• 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 US military acquisitions
• Progressive external ophthalmoplegia, a disease
• Programs Evaluation Office, a US Defense Department covert mission in Laos
• Parent Essential Oils, either parent omega-6 (LA) or parent omega-3 (ALA) -- to differentiate parent EFAs from derivatives being incorrectly called EFAs because the body can make these