PBT may refer to:
Science, technology and medicine Paul–Bunnell test, an heterophile antibody test Pentabromotoluene, an aromatic chemical compound Persistent, bioaccumulative and toxic substances, a class of compounds that have high resistance to degradation Polybutylene terephthalate, plastic used as an electrical insulator Proton beam therapy, a cancer treatment Provider Backbone Transport, IEEE 802.1 networking technology Preliminary breath test, with a hand-held breathalyzer Property-based testing, a software testing framework; for example see QuickCheck
Education Paper-based testing, such as TOEFL
Other uses Permian Basin Royalty Trust (NYSE symbol) Profit before tax, a variation of EBIT Progressing Ballet Technique, a form of cross training used for ballet that is uses ballet specific exercises similar to Pilates Pittsburgh Ballet Theatre, a ballet company in Pennsylvania, US "PBT", a song by Travis Scott, Tyla and Vybz Kartel from the 2025 album JackBoys 2