OPP
OPP, O.P.P., or Opp may refer to:

Government
NASA's Office of Planetary Protection
One Police Plaza (1PP), the Police headquarters in New York City
Ontario Provincial Police, the provincial police service of Ontario, Canada
Opp, Alabama, a city in the United States
Orleans Parish Prison, prison located in New Orleans, United States

Miscellaneous other organizations
Omega Psi Phi, an international fraternity
One People's Project, an anti-racist group
Opp (newspaper), published in Oppdal, Norway
Open Prosthetics Project, a project dedicated to creation of public domain prosthetics
Orangi Pilot Project, a development project in slums of Karachi, Pakistan

Science and technology
Object Push Profile, a Bluetooth communications protocol based on the OBEX protocol
Octonionic projective plane, or Cayley plane, a projective plane over the octonions
Oriented Polypropylene, and specifically BOPP (biaxially oriented PP), a polymer used mainly for packaging and labeling
Ortho-phenylphenol, or 2-Phenylphenol, an organic compound used as a fungicide
Ovine progressive pneumonia, or ovine lentivirus, a chronic infection of Visna virus that affects sheep
Yamaha YM2164, an FM synthesis sound chip also called FM Operator Type P (OPP)

Songs
"O.P.P." (song), a song by Naughty by Nature from the album Naughty by Nature
"Opps", a song by Vince Staples and Yugen Blakrok

See also
Opposition (disambiguation), shortened