BUN
| Acronym | Definition |
|---|---|
| BUN | Blood Urea Nitrogen |
| BUN | Buffalo, New York (border patrol sector) |
| BUN | Bundle |
| BUN | Boeddhistische Unie Nederland (Dutch: Buddhist Union Netherlands; est. 1978; Netherlands) |
| BUN | Bottom-Up Nanomachines (nanotechnology) |
| BUN | Baustoff-Union Neuenhagen (German energy firm; Neuenhagen, Brandenburg, Germany) |
| BUN | Bike User Network (University of Southampton; UK) |