| Blaupause | blueprint |
| Blausäure | hydrogen cyanide prussic acid hydrocyanic acid |
| Blasdüse | tuyere |
| Blattauge | leaf bud |
| Blaualge | cyanobacteria cyanophyta |
| Blaumeise | blue tit |
| Blaumiese | blues |
| Blauracke | European roller |
| Bauhaus | Bauhaus |
| Banause | ignoramus philistine |
| Brauhaus | diner |
| Blaubart | Bluebeard |
| Blaublüter | blue blood |
| Blauhäher | blue jay |
| Blaumerle | blue rock thrush |
| Blauzahn | Bluetooth |
| Blauzunge | blue-tongue lizard |
| Bläue | blueness |
| blaues Auge | black eye |
| blaugrau | blue-gray |