| autobiográfico | autobiographic |
| autobomba | fire engine |
| Autobots | Autobot |
| Autobus | Bus |
| autobús | bus |
| autobús de dos pisos | double-decker |
| autobús escolar | school bus |
| autocar | bus |
| Autocaravana | Caravanette |
| autocensura | self-censorship |
| autocine | drive-in |
| autocombustión | spontaneous combustion |
| autocomplacencia | complacency |
| autoconsciencia | self-awareness |
| autoconsciente | self-conscious |
| autocontrol | self-control |
| autocracia | autarchy |
| Autocromo | Autochrome Lumière |
| Autocross | Autocross |
| autocráticamente | autocratically |
| autocrático | absolute |
| autocrítica | self-criticism |
| Autocunnilingus | Autocunnilingus |
| Autodefensa de la República de Polonia | Self-Defense of the Republic of Poland |
| Autodefensas Unidas de Colombia | United Self-Defense Forces of Colombia |
| autodestrucción | self-destruction |
| autodestructivo | self-destructive |
| autodestruirse | self-destruct |
| autodeterminación | self-determination |
| autodidacta | self-educated |
| autodisciplina | temperance |
| Autodocumentación | Self-documented |
| Autodocumentado | Self-documented |
| Autodromo Enzo e Dino Ferrari | Autodromo Enzo e Dino Ferrari |
| Autodromo Nazionale Monza | Autodromo Nazionale Monza |
| autoecología | autoecology |
| autoespacio | eigenspace |
| autoestable | freestanding |
| autoestima | self-esteem |
| Autoestopista fantasma | Vanishing hitchhiker |
| Autoestrada | Motorway |
| autoevidente | self-evident |
| autoexpreso | motorail service |
| Autofagia | Autophagy |
| autofoto | selfie |
| Autoginofilia | Autogynephilia |
| autogiro | helicopter |
| autognosis | self-awareness |
| autogénesis | abiogenesis |
| autoinmolación | self-immolation |
| Autoire | Autoire |
| AutoIt | AutoIt |
| automación | automation |
