PTO

Entertainment

P.T.O. (video game), a war strategy simulation series by Koei based on the World War II events
"P:T:O:", a track from the 1977 Klaus Schulze album Body Love
The Phantom of the Opera (adaptations), or the Phantom character from any of these
Please Turn Over, a 1959 British comedy film
Promenade Theatre Orchestra, an English quartet founded in 1969

Patent and Trademark Office (disambiguation), a government office that handles the issuing of both patents and trademarks
Parent teacher organization, organization that consists of parents, teachers and school staff
Peace Train Organisation, a campaign group set up in response to the repeated bombing of the Dublin to Belfast railway line
Professional Triathletes Organisation, an organisation that representing non-drafting professional triathletes
Public Telecommunications Operator, a service provider of telecommunications services such as telephony and data communications access

Public Transport Operator
Pacific Theater of Operations, several
Paid time off, time an employee can draw from to take time off from work
Peeled tail-on shrimp
Permission to officiate, a form of license to undertake ecclesiastical duties within the Church of England
Phoenix Thunderbirds Open, a golf tournament on the LPGA Tour from 1962 to 1965
"Please turn over", written at the bottom of a double-sided document, see list of acronyms: P#PT
Professional tryout, a type of hockey contract in professional ice hockey
Proof-theoretic ordinal, a concept in ordinal analysis that refers to an ordinal assigned to a mathematical theories to measure their strength.
Zo'é language (ISO 639-3 code: pto)