| Acronym | Definition |
|---|
| PTB | Physikalisch Technische Bundesanstalt (Germany) |
| PTB | Partido Trabalhista Brasileiro (Portuguese: Brazilian Labor Party) |
| PTB | Powers That Be |
| PTB | Phosphotyrosine-Binding |
| PTB | Polypyrimidine Tract Binding Protein |
| PTB | Portland Trail Blazers |
| PTB | Place to Be |
| PTB | Passenger Terminal Building (aviation) |
| PTB | Penn Treebank |
| PTB | Portuguese Brazilian (language) |
| PTB | Patellar Tendon Bearing |
| PTB | Pass The Buck |
| PTB | Petersburg, Virginia (airport code) |
| PTB | Position Task Book (wildfire qualification system for firefighters) |
| PTB | Part Time Basis |
| PTB | Photonics Tech Briefs (magazine) |
| PTB | Ptahhotep's Team Balancer (Counter-Strike) |
| PTB | Physical Trade Balance |
| PTB | Please Text Back |
| PTB | Partial Test Ban (nuclear weapons) |
| PTB | Psychophysics Toolbox (vision reserach software) |
| PTB | Proto-Tibeto-Burman (languages) |
| PTB | Pounds Per Thousand Barrels |
| PTB | Passenger Transportation Board (Canada) |
| PTB | P-Town Ballers (band) |
| PTB | Paid to Blog (online income program) |
| PTB | Pimp This Bum (homelessness prevention) |
| PTB | Puro Tango Blast (Texas street/prison gang) |
| PTB | Portadown True Blues |
| PTB | Peer Transaction Bus |
| PTB | Personal Touch Banking |
| PTB | Pakistan Technology Board (Ministry of Science and Technology; Pakistan) |
| PtB | Paul the Bankie (Scottish football fan) |
| PTB | Program Time Base |
| PTB | Protective Technology Branch |
| PTB | Power Turbine Balance |
| PTB | Patrol Torpedo Boat |
| PTB | Paul Thorn Band |
| PTB | Project Team Builder (Project Management Institute; software) |
| PTB | Primetime Ballers (Youth Basketball) |
| PTB | Pillsbury Throw Boys (basketball team; est. 2010) |
| PTB | Professional, Technical Business (UK) |
| PTB | Push the Button |
| PTB | Push to Break (electronic switch type) |
| PTB | Phineas Taylor Barnum (circus founder) |
| PTB | Prevent the Bite (dog bite prevention program) |
| PTB | Paul Thomas Band |
| PTB | Phillips Taylor Brown (UK) |
| PTB | Proclamation to Blue (band) |
| PTB | Power Tab (computer program format) |
| PTB | Pre-Term Birth |
| PTB | Pulmonary Tuberculosis |