PTB
PTB is an abbreviation for:
- Parti du Travail de Belgique, political party in Belgium
- Partido Trabalhista Brasileiro, political party in Brazil
- Passaredo Transportes Aéreos, Brazilian airline
- Physikalisch-Technische Bundesanstalt, metrology institute of the Federal Republic of Germany with scientific and technical services
- Post-traumatic stress; see post-traumatic stress disorder
- Disambiguation
- Abbreviation