| PB | Problem | |
| PB | Polished Brass | |
| PB | Packard Bell | |
|
| PB | PunkBuster (gaming anti-cheat project) | |
| PB | Point-Blank | |
| PB | Playboy (magazine) | |
| PB | Publications | |
| PB | Paperback (book edition) | |
| PB | Peanut Butter | |
| PB | Pacific Beach (San Diego, California) | |
| PB | Personal Best (athletic record) | |
| PB | Playback | |
| PB | Plastic Bag (various companies) | |
|
| PB | Prison Break (TV Series) | |
| PB | Pitney Bowes | |
| PB | Paraíba (Brazilian state) | |
| PB | PowerBook (Macintosh) | |
| PB | Princess Bubblegum (Adventure Time) | |
| PB | Powerbuilder (Sybase software development tool) | |
| PB | Peripheral Blood | |
| PB | Public Bank | |
| PB | Phenobarbital (drug) | |
| PB | Played By (roleplay gaming) | |
| PB | Power Ball (lottery) | |
| PB | Photobucket (online image hosting service) | |
| P/B | Playback | |
| PB | Pit Bull | |
| PB | Passed Ball (baseball) | |
| PB | Private Banking | |
| PB | Power Brakes | |
| PB | Pushbutton | |
| PB | Pacific Beach (California) | |
| PB | Pandora's Box | |
| PB | Plumbum (Latin for the metallic element lead) | |
| P/B | Push Button | |
| PB | Performance-Based | |
| PB | Public Broadcasting | |
| PB | Photobook | |
| PB | Pot Belly | |
| PB | Primitive Baptist (religion) | |
| PB | President's Budget | |
| PB | Point B | |
| PB | Petabyte (1,024 terabytes) | |
| PB | Panic Bar (various companies) | |
| PB | Paintbrush | |
| PB | Pocket Book | |
| PB | Polybutylene | |
| PB | Paul's Boutique (UK) | |
| PB | Post Box | |
| PB | Parts Breakdown | |
| PB | Personal Business | |
| PB | Peroneus Brevis (muscle) | |
| PB | Potty Break | |
| PB | Presiding Bishop | |
| PB | Prussian Blue (ferric ferrocyanide antidote for Cs 137) | |
| PB | Particleboard | |
| PB | Princess Bride | |
| PB | Push-button Switch | |
| PB | Private Business | |
| PB | Poor Bastard | |
| PB | Punch Brothers (band) | |
| PB | Paint Ball | |
| PB | Page Break (proofreading; also HTML code) | |
| P/B | Preburner | |
| PB | Panera Bread (restaurant) | |
| PB | Professional Bookkeeper | |
| PB | Pry Bar | |
| PB | Performance Bond | |
| PB | Points Behind (hockey) | |
| PB | Pyridostigmine Bromide | |
| PB | Private Brand | |
| PB | Printed Board | |
| PB | Patrol Boat | |
| PB | Parker Brothers (game company) | |
| PB | Peptide Bond | |
| PB | Particle Beam | |
| PB | Penalty Box (hockey) | |
| PB | Payback Period | |
| PB | Publication Bias | |
| PB | Program Block | |
| PB | Plate Block | |
| PB | Parsons Brinckerhoff, Inc. (engineering firm) | |
| PB | Paddington Bear (children's storybook character) | |
| PB | Project Book | |
| PB | Pull Box | |
| PB | Property Bond (criminal justice) | |
| P/B | Price to Book value | |
| PB | Patrol Bomber (US aircraft designation of WW II) | |
| PB | Proportional Band | |
| PB | Plat Book | |
| PB | Pelvic Bone | |
| PB | Prime Broker | |
| PB | Preburner (US NASA) | |
| PB | Power Bomb (wrestling move) | |
| PB | Paddle Board | |
| PB | Phantom Brave (movie, gaming) | |
| PB | Page Buffer | |
| P/B | Program/Budget | |
| PB | Property Book | |
| PB | Probasin | |
| PB | Palladium Books (gaming company) | |
| PB | Program Baseline | |
| PB | Pulsed Beam | |
| PB | Pre-Briefed | |
| PB | Poor Bugger | |
| PB | Phonetically Balanced | |
| PB | Pepsi Blue (soft drink) | |
| P/B | Punch Biopsy | |
| PB | Project-Blue (GMod gaming clan) | |
| PB | Poly-Butadiene | |
| PB | Pool Bottom | |
| PB | Pneumatic Brake | |
| PB | Plug Board | |
| PB | Publications Bulletin | |
| PB | Post Boost | |
| PB | Pensions Board | |
| PB | Primary Branch | |
| PB | Personal Base (station) | |
| PB | Product Baseline | |
| PB | Pass Balanced (Front Page Sports Football '95 et al) | |
| PB | Preppy Boy | |
| Pb | Probability of Bit Error | |
| PB | Plot Bunny (fan fiction) | |
| PB | Photon Burst | |
| PB | Packet Bus | |
| PB | Pulau Bintan (Indonesia) | |
| PB | Productive Burp (post surgery) | |
| PB | Pax Britannia | |
| PB | Probability of Blocking (data transferring) | |
| PB | Park Bravo (Turkey) | |
| PB | Polar Ball (game) | |
| PB | Pharmacopoeia Britannica | |
| PB | Phunky Bitch (women's group) | |
| PB | Personal Barometer (domestic water consumption calculation application) | |
| PB | Privately Baptised (genealogy) | |
| PB | Pryidostigmine Bromide | |
| PB | Pre-Blackout | |
| PB | Predicted and Bi-Directional | |
| PB | Perkins Bacon, Ltd. (stamp printers, Great Britain) | |
| PB | Physical Inventory, Beginning | |
| PB | Prefered Bidder (OJEU tendering process) | |
| PB | Pro Baddies (World of Warcraft gaming clan) | |
| P/B | Peak/Basal Ratio | |