BTB may refer to:
In biology:
- Blood–testis barrier in testicular anatomy
- Blood–thymus barrier
- Bovine tuberculosis or Mycobacterium bovis, a disease originating in cattle
- Breakthrough bleeding, of the menstrual period
- Bromothymol blue, a chemical indicator for weak acids and bases
- BTB/POZ domain, a protein domain
In other uses:
- Belgian Union of Transport Workers, a trade union in Belgium
- Branch target buffer, a computer processor element
- Bétou Airport, in the Republic of the Congo (IATA airport code: BTB)
- Basil Temple Blackwood (1870–1917), British book illustrator (credited as B.T.B.)
- Bob the Builder, British children's television series
This disambiguation page lists articles associated with the title BTB.
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