| Butters Stotch | Leopold Stotch |
| butterscotch | caramella di zucchero e burro fusi |
| Butterworth filter | Filtro Butterworth |
| Buttisholz | Buttisholz |
| buttock | sedere |
| buttocks | sedere |
| button | clitoride |
| Button cactus | Epithelantha |
| button mushroom | champignon |
| button-cell battery | pila a bottone |
| buttonhole | occhiello |
| buttoning | abbottonatura |
| buttress | corroborazione |
| Buttwil | Buttwil |
| Butty | Sandwich |
| Butuan City | Butuan |
| butyl | butile |
| Butyl acetate | Acetato di n-butile |
| Butylated hydroxyanisole | Butilidrossianisolo |
| Butylated hydroxytoluene | Butilidrossitoluene |
| butylic | butilico |
| butyric acid | acido butirrico |
| Butzbach | Butzbach |
| Buus | Buus |
| Buxaceae | Buxaceae |
| Buxheim | Buxheim |
| buxom | paffuto |
| Buxtehude | Buxtehude |
| Buxus | Buxus |
| Buxus sempervirens | Buxus sempervirens |
| Buxus sempevirens | Buxus sempervirens |
| buy | acquisto |
| buy back | riscattare |
| buy from | servirsi da |
| buy in | comprare una scorta di |
| buy into | bersela |
| Buy Nothing Day | Giornata del non acquisto |
| buy off | comprare |
| buy on credit | comprare a rate |
| Buy on easy terms | Acquistare a rate |
| buy out | rilevare |
| buy something outright | comprare in contanti |
| buy through an installment plan | comprare a rate |
| Buy U a Drank | Buy U A Drank |
| buy up | comprare l'intero stock |
| Buyei | Bố Y |
| Buyeo | Buyeo |
| Buyeo County | Buyeo |
| buyer | compratore |
| Buyid dynasty | Buwayhidi |
| buying | compra |
| buying spree | spese folli |
| buyout | rilevamento |
| Buzau | Buzău |
| Buzen Province | Buzen |
| Buzet | Pinguente |
| buzz | chiamare |
| Buzz Aldrin | Buzz Aldrin |
| Buzz Lightyear of Star Command | Buzz Lightyear da Comando Stellare |
| buzz off | andarsene |
| buzzard | poiana |
| Buzzcocks | Buzzcocks |
| buzzer | segnalatore acustico |
| Buzzer beater | Buzzer beater |
| buzzing | brusio |
| Buzău | Buzău |
| Buzău County | Distretto di Buzău |
| Buzău River | Buzău |
| Bušince | Bušince |
| BV | BV |
| BW | BW |
| Bwin | Bwin |
| Bwindi Impenetrable National Park | Parco nazionale impenetrabile di Bwindi |
| BWV | Bach-Werke-Verzeichnis |
| BX | BX |
| by | presso |
| by a fluke | per puro caso |
| by accident | per sbaglio |
| by all means | certamente |
| by and large | in complesso |
| by any chance | per caso |
| by certified mail | per raccomandata |
| by chance | all'improvviso |
| by contrast with | a confronto di |
| by degrees | gradatamente |
| BY Draconis variable | Variabili BY Draconis |
| by express | per espresso |
| by far | di gran lunga |
| by giro | per giroconto |
| by hand | manuale |
| by heart | a memoria |
| by instalments | rateale |
| by itself | da solo |
| by Jove | per Giove |
| by lack of | in mancanza di |
| by letter | per lettera |
| By me | Passaporto |
| by means of | con |
| by mistake | per sbaglio |
| by no means | a nessun patto |
| by now | già |
| by oneself | solo |
| by order of the authorities | per ordini che vengono dall'alto |
| by prescription | recipe |
| by private treaty | privatamente |
| by reason of | perché |
| by registered mail | per raccomandata |
| by return of post | a posta corrente |
| By rule of thumb | A lume di naso |
| by superior order | per ordini che vengono dall'alto |
| by telephone | per telefono |
