TB
TB or Tb may refer to:

Science and technology
Computing
Terabyte (TB), a unit of information (often measuring storage capacity)
Terabit (Tb), a unit of information (often measuring data transfer)
Thunderbolt (interface)
Test bench

Vehicles
T.B. (Thompson Brothers), a three-wheeled cyclecar manufactured by Thompson Brothers of Bilston, England, from 1919 until 1924
Torpedo boat, a relatively small and fast naval vessel designed to carry torpedoes into battle
Boeing TB, an American torpedo bomber biplane designed by the US Navy and built by Boeing in 1927

Other uses in science and technology
Terbium, symbol Tb, a chemical element
Terrific broth, a bacterial growth medium for E. coli
Tuberculosis (TB), a chronic infectious disease
Tubercle bacillus, another name for Mycobacterium tuberculosis, the pathogen causing tuberculosis.
Brightness temperature (Tb), in astrophysics

Sports
TB Tvøroyri (Tvøroyrar Bóltfelag), a Faroese football club from Tvøroyri
Tampa Bay Buccaneers, a professional American football team in the Tampa Bay Area
Tampa Bay Lightning, a professional ice hockey team in the Tampa Bay Area
Tampa Bay Rays, a professional baseball team in the Tampa Bay Area
Total bases, a baseball statistic
Terry Bradshaw, professional football quarterback
Tom Brady, professional football quarterback

Other uses
Tablespoon (tb), a rough, culinary unit of volume
Tommy Brown (record producer) (also known as TB or TB Hits), American record producer and songwriter
Taco Bell, an American chain of fast-food restaurants
Teboil (until 1966 TB), a Finnish gas station company
Tekkaman Blade, a Japanese animated TV series
TowneBank, a bank serving Virginia and North CarolinaPlaces in the United States

TB, Maryland, an unincorporated community
Tampa Bay, Florida