| Blue Öyster Cult | Blue Öyster Cult |
| Blue-and-yellow Macaw | Ara bleu |
| Blue-bellied Roller | Rollier à ventre bleu |
| Blue-billed Duck | Érismature australe |
| blue-black | bleu foncé |
| Blue-breasted Kingfisher | Halcyon malimbica |
| Blue-cheeked Amazon | Amazone de Dufresne |
| Blue-cheeked Bee-eater | Guêpier de Perse |
| blue-chip securities | valeurs de premier ordre |
| blue-collar worker | ouvrier |
| Blue-crowned Hanging Parrot | Loriculus galgulus |
| Blue-crowned Motmot | Motmot houtouc |
| Blue-crowned Parakeet | Aratinga acuticaudata |
| blue-eyed | aux yeux bleus |
| Blue-eyed Black Lemur | Lémur aux yeux turquoise |
| Blue-eyed Cockatoo | Cacatua ophthalmica |
| Blue-eyed grass | Sisyrinchium |
| Blue-eyed soul | Blue-eyed soul |
| Blue-faced Honeyeater | Entomyzon cyanotis |
| Blue-footed Booby | Fou à pieds bleus |
| Blue-fronted Amazon | Amazone à front bleu |
| Blue-gray Gnatcatcher | Gobemoucheron gris-bleu |
| blue-green alga | algue bleue |
| Blue-headed Parrot | Pionus menstruus |
| Blue-headed Pitta | Pitta baudii |
| Blue-naped Pitta | Pitta nipalensis |
| blue-pencil | censurer |
| Blue-ringed octopus | Hapalochlaena |
| Blue-spotted Salamander | Salamandre à points bleus |
| Blue-tailed day gecko | Gecko diurne à queue bleue |
| Blue-throated Macaw | Ara à gorge bleue |
| Blue-throated Motmot | Motmot à gorge bleue |
| Blue-tongued skink | Tiliqua |
| Blue-winged Goose | Ouette à ailes bleues |
| Blue-winged Macaw | Ara de Illiger |
| Blue-winged Parrot | Neophema splendida |
| Blue-winged Pitta | Pitta moluccensis |
| Blue-winged Teal | Sarcelle soucrourou |
| Bluebeard | Barbe-Bleue |
| bluebell | campanule |
| blueberry | airelle |
| bluebird | grive nord-américaine |
| Bluebird Records | Bluebird |
| Bluebirds | Turdinae |
| bluebottle | barbeau |
| Bluebuck | Hippotragus leucophaeus |
| Bluecheek butterflyfish | Chaetodon semilarvatus |
| bluefin tuna | thon rouge |
| bluefish | tassergal |
| Bluegrass music | Bluegrass |
| Bluegrass State | Kentucky |
| bluejeans | jean |
| blueprint | bleu |
| blues | déprime |
| Blues Brothers | The Blues Brothers |
| Blues Explosion | Jon Spencer Blues Explosion |
| Blues harp | Harmonica diatonique simple |
| Blues standard | Standard du blues |
| Blues-rock | Blues rock |
| Bluespotted ribbontail ray | Raie pastenague à points bleus |
| bluestocking | bas-bleu |
| Bluestripe snapper | Lutjanus kasmira |
| bluethroat | gorge-bleue à miroir |
| bluetongue | fièvre catarrhale |
| Bluetooth | Bluetooth |
| Bluey | Poil de carotte |
| Bluff Dale | Bluff Dale |
| bluffer | bluffeur |
| bluish | bleuâtre |
| bluishness | bleuâtreté |
| Blum Blum Shub | Blum Blum Shub |
| Blum-Goldwasser cryptosystem | Cryptosystème de Blum-Goldwasser |
| Blumberg | Blumberg |
| Blumegg | Blumegg |
| Blumenstein | Blumenstein |
| blunder | bévue |
| blunderbuss | tromblon |
| blunderer | maladroit |
| blunt | brusque |
| Blunt-eared Bat | Tomopeas ravus |
| bluntly | à brûle-pourpoint |
| Bluntnose sixgill shark | Requin griset |
| blur | marque |
| blurb | notice publicitaire |
| blurred | trouble |
| blurry | flou |
| blurt | laisser |
| Blurt out secrets | Clavecin |
| blush | rougeur |
| blusher | rouge |
| blushing | rougissant |
| bluster | se vanter |
| blustering | impétueux |
| blustery | bruyant |
| Blutengel | BlutEngel |
| Blutgericht | Haute justice |
| Bluto | Brutus |
| blutworst | boudin |
| Blyde River Canyon | Blyde River Canyon |
