| Acronym | Definition |
|---|
| B2B | Business to Business |
| B2B | Business 2 Business |
| B2B | Back to Basics |
| B2B | Back to Back |
| B2B | Bay to Breakers (annual footrace; San Francisco, CA) |
| B2B | Back to Business |
| B2B | Bus to Bus |
| B2B | Buffer to Buffer |
| B2B | Back to Base |
| B2B | Border to Border |
| B2B | Back to Banking |
| B2B | Brother 2 Brother (greek gaming clan) |
| B2B | Bridges to Babylon (Rolling Stones album) |
| B2B | Bottle to Bottle (plastics recycling) |
| B2B | Bottom 2 Box (marketing metric) |
| B2B | Back to Bankruptcies |
| B2B | 'Bout to Bounce (chat) |
| B2B | Baptist 2 Baptist (Southern Baptist Convention) |
| B2B | Back-2-Bangalore |
| B2B | Boundary-Corrected Second Born (for scattering) |
