| auto-explicatif | self-explanatory |
| Auto-extractible | Self-extracting archive |
| auto-immolation | self-immolation |
| auto-imposé | self-imposed |
| auto-pollinisation | self-pollination |
| auto-référence | self-reference |
| auto-sacrifice | self-sacrifice |
| auto-satisfait | smug |
| auto-stoppeur | hitchhiker |
| auto-stoppeuse | hitchhiker |
| auto-tracté | self-propelled |
| Auto-érotisme | Masturbation |
| Autoabsorption | Self absorption |
| autobiographie | autobiography |
| autobiographique | autobiographic |
| Autobronzant | Sunless tanning |
| autobus | bus |
| Autobus guidé | Guided bus |
| autobus scolaire | school bus |
| autobus à impériale | double-decker |
| autocar | bus |
| autocaravane | mobile home |
| Autochrome | Autochrome Lumière |
| autochtone | autochthonous |
| Autochtones du Québec | Aboriginal peoples in Quebec |
| autocollant | sticker |
| Autocollimation | Autocollimation |
| autoconscient | self-aware |
