| Black-mantled Tamarin | Saguinus nigricollis |
| black-necked grebe | zampullín cuellinegro |
| Black-necked Screamer | Chauna chavaria |
| Black-necked Stork | Ephippiorhynchus asiaticus |
| Black-rumped Waxbill | Estrilda troglodytes |
| Black-Scholes | Black-Scholes |
| Black-shouldered Kite | Elanus caeruleus |
| Black-shouldered Opossum | Caluromysiops irrupta |
| black-tailed godwit | aguja colinegra |
| black-throated antshrike | batará gorginegro |
| black-throated diver | colimbo ártico |
| Black-throated Trogon | Trogon rufus |
| black-tie | de traje de etiqueta |
| Black-winged Kite | Elanus caeruleus |
| Black-winged Lory | Eos cyanogenia |
| Blackadder | La Víbora Negra |
| Blackamoors | Negro |
| blackball | bola negra |
| blackballing | bola negra |
| Blackbeard | Barbanegra |
| blackberry | zarza |
| blackberry bush | zarza |
| blackbird | mirlo |
| blackboard | pizarra |
| Blackboard Jungle | Semilla de maldad |
| blackbody | cuerpo negro |
| Blackbox | Blackbox |
| Blackburn | Blackburn |
| Blackburn Buccaneer | Blackburn Buccaneer |
| blackcap | curruca capirotada |
| blackcurrant | grosella negra |
| blacken | tostar |
| Blackened death metal | Blackened Death Metal |
| blackening | acción de ennegrecer |
| Blackfeet | Blackfeet |
| Blackfoot | Blackfeet |
| Blackfriars Theatre | Blackfriars |
| blackguard | bribón |
| blackhead | espinilla |
| blackish | negruzco |
| blackish-gray antshrike | batará ceniciento |
| blackjack | veintiuno |
| blackleg | ántrax |
| blacklist | poner en la lista negra |
| blackmail | chantajear |
| blackmailer | chantajista |
| Blackmar-Diemer Gambit | Gambito Blackmark-Diemer |
| blackness | oscuridad |
| blackout | pana |
| Blackpool | Blackpool |
| Blackpowder | Pólvora |
| Blacksad | Blacksad |
| Blackshirt | fascista |
| blacksmith | herrero |
| Blacksmith Institute | Blacksmith Institute |
| Blackstreet | BLACKstreet |
| blackthorn | endrino |
| blackwater | agua residual |
| blackwater fever | malaria |
| Blackwater Worldwide | Blackwater USA |
| Blackwood Farm | Blackwood Farm |
| bladder | vejiga |
| bladder cherry | alquequenje |
| Bladder related | Vesical |
| bladder wrack | alga negra común |
| blade | corte |
| Blade II | Blade II |
| blade of grass | brizna de hierba |
| Blade of the Immortal | La espada del inmortal |
| Blade Runner | Blade Runner |
| Blade server | Servidor blade |
| Bladebone | Escápula |
| Bladerunner | Blade Runner |
| Blades of grass | Hojas de hierba |
| BLAG Linux and GNU | BLAG Linux and GNU |
| Blagnac | Blagnac |
| Blagoevgrad | Blagoevgrad |
| Blagoveshchensk | Blagovéshchensk |
| blah | palabrerías |
| blah-blah | decir tonterías |
| Blaise Cendrars | Blaise Cendrars |
| Blaise Compaoré | Blaise Compaore |
| Blaise de Vigenère | Blaise de Vigenere |
| Blaise Pascal | Blaise Pascal |
| Blake and Mortimer | Blake y Mortimer |
| blamable | censurable |
| blame | acusar |
| blame for | culpar de |
| blame on | atribuir a |
| blame somebody | culpar a alguien |
| blameable | censurable |
| blameless | inocente |
| blameworthiness | culpa |
| blameworthy | censurable |
| Blanca of Bourbon | Blanca de Borbón |
| Blanca of Navarre | Blanca II de Navarra |
