3B
# 3B

3B or 3-B may refer to:

* Third baseman
* Triple (baseball)
* 3B Computers, a range of computers produced by AT&T during the 1980s
* 3B Junior, a department of the Japanese entertainment company Stardust Promotion
* 3B Lab, a Japanese popular music group
* Three Bs, a designation for three well-known classical composers

3B may refer to:

