PTT
- 2β-propanoyl-3β-(4-tolyl)-tropane
- Chuck E. Cheese
- PTT (Paint the Town)
- PTT (Switzerland)
- PTT (Turkey)
- PTT Bulletin Board System
- PTT Public Company Limited
- Partial thromboplastin time
- Pashtun Tahafuz Movement
- Pass-the-ticket
- Pennsylvania Tunnel and Terminal Railroad
- Petronas Twin Towers
- Photothermal Therapy
- Photothermal time
- Pneumatic tube
- Police Tactical Team
- Polytrimethylene terephthalate
- Port Talbot Town F.C.
- Postal, telegraph and telephone service
- Posterijen, Telegrafie en Telefonie (Netherlands)
- Postes, télégraphes et téléphones (France)
- Power transition theory
- Prince's Trust Team
- Pull Tiger Tail
- Push to talk