William Dalrymple (historian)

PEI or Pei may refer to:

• Matecaña International Airport, Pereira, Colombia, IATA code PEI
• Pei County (沛县), Jiangsu, China
• Pei Commandery (沛郡), a commandery in Chinese history
• Prince Edward Island, a province of Canada
• Pei, Tibet, a town in Tibet

• Bei (surname) (貝), romanized Pei in Wade–Giles
• Pei (surname), a Chinese surname (裴) or an Italian surname
• I. M. Pei (1917–2019), a Chinese-American architect
• Mario Pei (1901–1978), an Italian-American linguist

• Polyetherimide (PEI), a thermoplastic similar to PEEK
• Polyethylenimine (PEI), a type of water-soluble polymer

• Paul Ehrlich Institute, Germany
• Pei language
• Pe (Semitic letter) (פ), or pei, a letter in the Hebrew alphabet
• Princeton Environmental Institute of Princeton University
• Private Equity International, a financial magazine
• Private Education Institution (Singapore)
• Shar Pei, a wrinkled dog breed
• Pie
• Pee (disambiguation)