| Acronym | Definition |
|---|
| OTP➣One Time Password |
| OTP➣Office of the Prosecutor (International Criminal Court; Netherlands) |
| OTP➣One Time Programmable (electronics) |
| OTP➣One Time Pad |
| OTP➣One Time Payment (customer service) |
| OTP➣On the Phone (chat) |
| OTP➣Obligatorisk Tjenestepensjon (Norwegian: Mandatory Occupational Pension) |
| OTP➣Office of the Premier (various locations) |
| OTP➣On-Time Performance |
| OTP➣Over Temperature Protection |
| OTP➣One Touch Phone (smartphone) |
| OTP➣on the Phone |
| OTP➣Open Trading Protocol |
| OTP➣One Time Programmable |
| OTP➣Order Transaction Processing |
| OTP➣One Time Payment |
| OTP➣Opposite Track Path |
| OTP➣On Track Plant (rail vehicle; UK) |
| OTP➣Over the Phone |
| OTP➣Operator Training Program (various organizations) |
| OTP➣Open Telecom Platform |
| OTP➣Opposite Track Path (DVD mastering system) |
| OTP➣Online Team Play (gaming) |
| OTP➣Outside the Perimeter (people living outside the I-285 perimeter of Atlanta, GA) |
| OTP➣Open Trading Protocol (for purchasing) |
| OTP➣Off the Page |
| OTP➣Opioid Treatment Program |
| OTP➣One Term President |
| OTP➣One-Trick Pony (Paul Simon song/album) |
| OTP➣Open Training Platform (various organizations) |
| OTP➣Offender Treatment Program (various locations) |
| OTP➣Offer to Purchase |
| OTP➣Order to Pay |
| OTP➣One True Pairing |
| OTP➣Optical Transport Platform (various companies) |
| OTP➣Orientation Training Program (various organizations) |
| OTP➣Officers Training Program (various locations) |
| OTP➣Office of Telecommunications Policy |
| OTP➣Oregon Transportation Plan |
| OTP➣Occupational Training Program (various organizations) |
| OTP➣Oil Treatment Plant |
| OTP➣Other Tobacco Product (taxation designation) |
| OTP➣Bucharest, Romania - Otopeni (Airport Code) |
| OTP➣Operations Test Plan (US NASA) |
| OTP➣Owner's Title Policy (real estate) |
| OTP➣Orlando Theatre Project (Orlando, FL) |
| OTP➣Outpatient Treatment Program |
| OTP➣Outdoor Therapeutic Program |
| OTP➣Odznaka Turystyki Pieszej (Polish PTTK badge) |
| OTP➣Olympic Transport Plan (UK) |
| OTP➣Ore Transport Permit (Department of Environment and Natural Resources; Philippines) |
| OTP➣Operational Test Piece |
| OTP➣On the Piss |
| OTP➣Outline Test Plan |
| OTP➣Other Transfer Payment (various organizations) |
| OTP➣Operational Test Plan |
| OTP➣On the Pause |
| OTP➣Operational Test Procedure |
| OTP➣Országos Takarék Pénztár (Hungarian: General Saving Bank) |
| OTP➣One True Pair/Pairing (fan fiction, erotica) |
| OTP➣Overtime Personnel |
| OTP➣Openland Tree-Planting |
| OTP➣One Team Partner |
| OTP➣Other Theater Project (Cleveland, Ohio) |
| OTP➣Orbital Time Processor |
| OTP➣Other Trustworthy Person (PEZ collectors) |
| OTP➣Operating & Transition Plan |
| OTP➣Optional Time Period |
| OTP➣Optical Technology Project |
| OTP➣Oh, the Profanity! (blog) |
| OTP➣Operational Trial Period |
| OTP➣Operations Training Package |
| OTP➣Off the Pigs (band) |