PEO may stand for: *

Parking enforcement officer A parking enforcement officer (PEO),United S ...

, an official who issues parking tickets * Plasma electrolytic oxidation, a surface-treatment process for metals * Polyethylene oxide, alternate name for Polyethylene glycol, a polymer *

Old Persian Old Persian is one of the two directly attested Old Iranian languages (the other being Avestan language, Avestan) and is the ancestor of Middle Persian (the language of Sasanian Empire). Like other Old Iranian languages, it was known to its native ...

, ISO 639-2 and ISO 639-3 language code peo * Pancyprian Federation of Labour, an umbrella organization for trade unions in Cyprus ( el, Παγκύπρια Εργατική Ομοσπονδία, links=no, ) *

P.E.O. Sisterhood The P.E.O. Sisterhood (Philanthropic Educational Organization) is a U.S.-based international women's organization of about 230,000 members, with a primary focus on providing educational opportunities for female students worldwide. The 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, professional and regulatory organization for engineers in Ontario, Canada * Program executive officer, an individual, civilian or military, responsible for large scale U.S. military acquisitions * Programs Evaluation Office, a covert U.S. paramilitary mission in Laos in 1955-1962 * Progressive external ophthalmoplegia, alternate term for chronic progressive external ophthalmoplegia, an eye disorder

See also