PY, Py, py or P-Y may stand for:

People Eugène Py, a French cinema pioneer of the Cinema of Argentina Jorge Py, a Brazilian footballer Olivier Py, a French stage director, actor and writer Delphine Py-Bilot, a French triathlete Piye, a Kushite king and founder of the Twenty-fifth dynasty of Egypt Pierre-Yves Gerbeau, French businessman

Science and technology Python (programming language), which uses the filename extension '.py' .py, the country code top level domain (ccTLD) for Paraguay py (unit), a Korean unit of floorspace area petayear, Py, 1015 year Py (cipher), a stream cipher designed by Eli Biham and Jennifer Seberry p-y method, for assessing the load-bearing abilities of deep foundations Permalloy, a nickel-iron magnetic alloy Pyridine, a common monodentate ligand in coordination chemistry, abbreviated as 'py'

Other uses Py, Pyrénées-Orientales, a commune of the Pyrénées-Orientales département in southwestern France Pack year, a measure of cigarette smoking Paraguay, ISO 3166-1 country code Puducherry, formerly Pondicherry, a union territory of India Pinyin, a system of romanization (phonetic notation and transliteration to Roman script) for Mandarin Chinese Portsmouth yardstick, used as a rating system in yacht racing and dinghy racing Surinam Airways (IATA airline designator PY) A US Navy hull classification symbol: Patrol yacht (PY) Southwest Papua (vehicle registration prefix PY)