PTO

PTO may refer to:

Sports

Phoenix Thunderbirds Open, a golf tournament on the LPGA Tour from 1962 to 1965
Professional Triathletes Organisation, an organisation that representing non-drafting professional triathletes
Professional tryout, a type of professional ice hockey contract

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, a former English quartet

Peace Train Organisation, a campaign group set up in response to the repeated bombing of the Dublin to Belfast railway line
Power take-off, one of several methods for taking power from a power source
Public Transport Operator

Permeability tuned oscillator, an electronic circuit; see 75A-4 and KWS-1#PTOsc
"Please turn over", written at the bottom of a double-sided document; see List of acronyms: P#PT
Public Telecommunications Operator, a service provider of telecommunications services such as telephony and data communications access
Zoʼé language (ISO 639-3 code: pto)

Pacific Theatre of Operations (disambiguation)
Paid time off, time an employee can draw from to take time off from work
Parent teacher organization, organization that consists of parents, teachers and school staff
Parietal-temporal-occipital, an area of the brain
Patent and Trademark Office (disambiguation), a government office that handles the issuing of both patents and trademarks
Peeled tail-on shrimp, in shrimp marketing
Permission to officiate, a form of license to undertake ecclesiastical duties within the Church of England
Proof-theoretic ordinal, an ordinal assigned to mathematical theories to measure their strength