| blindaje | shield |
| Blindaje reactivo | Reactive armour |
| Bling bling | Bling-bling |
| blister | blister pack |
| Blitz | The Blitz |
| Blitzball | Blitzball |
| Blitzingen | Blitzingen |
| Blitzkrieg | Blitzkrieg |
| Blixa Bargeld | Blixa Bargeld |
| BLOB | Binary large object |
| bloboque | blob |
| bloc | pad |
| bloc de apuntes | notepad |
| bloc de dibujo | sketchbook |
| bloc de hojas | notepad |
| bloc de notas | notepad |
| Bloc de notas electrónico | Palm computer |
| Bloc Party | Bloc Party |
| Bloc Québécois | Bloc Québécois |
| blocao | blockhouse |
| Bloco de Esquerda | Left Bloc |
| Bloemfontein | Bloemfontein |
| blog | weblog |
| Blog ficción | Blog fiction |
| blogger | blogger |
| Blogroll | List of blogging terms |
| bloguera | blogger |
| bloguero | blogger |
| Blois | Blois |
| Blonay | Blonay |
| Blondi | Blondi |
| Blood and Gold | Blood and Gold |
| Blood in blood out | Blood in Blood Out |
| Bloodhound Gang | Bloodhound Gang |
| Bloody Mary | Bloody Mary |
| Bloomberg | Bloomberg |
| Bloomberg TV | Bloomberg Television |
| Bloomsbury Publishing | Bloomsbury Publishing |
| Bloq Mayús | Caps lock |
| bloque | pad |
| Bloque comercial | Trade bloc |
| Bloque de agua | Water block |
| bloque de apartamentos | apartment block |
| Bloque de Avance de la India | All India Forward Bloc |
| Bloque de Cascajal | Olmec hieroglyphs |
| Bloque de control del proceso | Process control block |
| Bloque de hormigón | Concrete masonry unit |
| Bloque de la tabla periódica | Periodic table block |
| Bloque de Naciones Antibolcheviques | Anti-Bolshevik Bloc of Nations |
| bloque de viviendas | tenement |
| Bloque del Este | Eastern bloc |
| Bloque Nacionalista Galego | Galician Nationalist Bloc |
| Bloque superior de memoria | Upper memory blocs |
| Bloqueador de canales de calcio | Calcium channel blocker |
| bloquear | block up |
| bloquearse | lock |
| bloqueo | obstruction |
