PTB
- Bermuda Public Transportation Board
- Bessarabian Peasants' Party
- Brazilian Labour Party (current)
- Brazilian Labour Party (historical)
- Desalter
- IPv6 packet
- N-Phenacylthiazolium bromide
- P.T.B. (album)
- Pakistan Tobacco Board
- Party of Labour of Burkina
- Pentre-bach railway station
- Permian-Triassic boundary
- Petersburg station
- Petit train de banlieue
- Phosphotyrosine-binding domain
- Physikalisch-Technische Bundesanstalt
- Placer Theatre Ballet
- Polypyrimidine tract-binding protein
- Portland Trail Blazers
- Power Tab Editor
- Project team builder
- Proto-Tibeto-Burman language
- Proto-Torres-Banks language
- Public Test Build
- Pulmonary tuberculosis
- Push to break
- The powers that be (disambiguation)
- Voepass Linhas Aéreas
- Workers' Party of Belgium