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, a very soft grade of pencil lead
3B may refer to:
See also edit
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