• Pacific Electric Railway
• Air Europe Italy (IATA airline designator)
• Pernambuco, a state of Brazil
• Peru (ISO 3166-1 alpha-2 country code, NATO country code)
• PE postcode area, Peterborough postcode area
• Prince Edward Island (Canadian Province/Territory Code)
• AEG PE, a German World War I armored ground-attack aircraft

PE may refer to:

• Parasite Eve, a Japanese novel by Hideaki Sena (it could also refer to the video game of the same name for the Sony PlayStation)
• Provider edge, a router between computer networks
• P/E ratio, price-to-earnings ratio, a measure of the price paid for a share relative to the annual income or profit earned by the firm per share
• Phosphatidyl ethanolamine
• Physical education, a school or college class including physical exercise
• Physical examination, a thorough check-up performed by a doctor
• Polyethylene, a common plastic polymer
• Population equivalent, in sewage treatment
• Port Elizabeth, a city in South Africa
• Portable Executable, a computer file format
• Potential energy, energy stored within a physical system
• Private equity, equity investments in companies that are not traded on a public stock exchange
• Private Eye, a character class in the MMORPG Neocron
• Premature ejaculation
• Windows Preinstallation Environment, a lightweight version of Microsoft Windows
• The Press-Enterprise (California), a newspaper serving the Inland Empire in Southern California
• Processing element, a single unit in parallel computing
• Principles and Practice of Engineering Exam, an engineering examination in the United States
• Profane Existence, a Minneapolis-based anarcho-punk collective
• Professional Engineer, a term for registered or licensed engineers in some countries
• Prolonged exposure therapy, a form of behavior therapy designed to treat posttraumatic stress disorder
• Protective earth, a type of electrical protective system
• Protocol encryption, a feature of some peer-to-peer file-sharing clients
• Project Entropia, a massively multiplayer online virtual universe
• Public Enemy (band), a hip hop group from Long Island, New York
• Pulmonary edema, swelling and/or fluid accumulation in the lungs
• Pulmonary embolism, a blockage of the pulmonary artery
• Punctuated equilibrium, a theory of evolutionary biology
• Phycoerythrin, a water-soluble protein used as a fluorescent marker in microscopy and flow cytometry
• Princess Elizabeth Challenge Cup, a rowing event at Henley Royal Regatta
• Phenylephrine, an adrenergic receptor agonist used primarily as a decongestant

Pe may refer to:

• one of the two ancient Egyptian towns which merged to become Buto
• Pe (letter), a letter in many Semitic alphabets
• Pe (Cyrillic) (П), a letter in the Cyrillic alphabet
• $wp$ a letter in some mathematical literature, including the Weierstrass's elliptic functions
• Pe, one of the transliterations of the fourth syllable in Buddhist mantra Om mani padme hum
• Pe (text editor), a text editor for the BeOS operating system
• Pe, a town on the Yarlung Tsangpo River (Tibet)

Pe is an abbreviation for:

• Péclet number, in physics
• Eh(V) = 0.059·pe, in the Nernst equation in electrochemistry