JB or J.B. may refer to:
Literature
- J.B. (play), a 1958 play by Archibald MacLeish in verse, based on the Book of Job
- Jerusalem Bible, a 1966 Roman Catholic Bible translation
People
- BlocBoy JB (born 1996), American rapper
- JB (Swedish musician), Swedish musician
- Jaffar Byn, Swedish rapper known as JB
- JB (Canadian rapper), Canadian male rapper
- JB (South Korean singer) (born 1994), South Korean musician
- J. B. Smoove (born 1965), American actor and comedian
- Jack Black (born 1969), American actor and comedian
- Joe Biden (born 1942), current president of the United States
- Justin Bieber (born 1994), Canadian singer
- Justin Brownlee (born 1988), American basketball player in the Philippines
- Jesse Baird (1997–2024), Australian television presenter and AFL umpire
Technology and engineering
- British Rail Class 73 locomotives
- Jungfraubahn, a rack railway
Other uses
- Johor Bahru, a city in Malaysia
- J&B RARE Whisky, by Justerini & Brooks
- JB Hi-Fi, Australia
- JB Catalogue of Malta Stamps and Postal History
- Jornal do Brasil, a newspaper
- Junior branch, members of CISV aged 11-25
- Helijet (IATA code JB)
- JB, local train services on the Chūō–Sōbu Line in Japan