| Authorware | Macromedia Authorware |
| Autigny | Autigny |
| autisme | autism |
| Autisme de haut niveau | High-functioning autism |
| autistique | autistic |
| auto | car |
| auto caravane | mobile home |
| auto de course | racecar |
| Auto en stationnement | Automobile |
| Auto nombre | Self number |
| auto tamponneuse | bumper car |
| Auto Technisches Spezialzubehör | ATS |
| Auto Union | Auto Union |
| auto- | self- |
| Auto-absorption | Self absorption |
| Auto-allumage | Self ignition |
| auto-amélioration | self-improvement |
| Auto-analyse | Self knowledge |
| Auto-anticorps | Autoantibody |
| auto-apprentissage | self-learning |
| auto-censure | self-censorship |
| Auto-cunnilingus | Autocunnilingus |
| auto-détruire | self-destruct |
| Auto-efficacité | Self-efficacy |
| 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 |
| autoconservation | self-preservation |
| Autocovariance | Autocovariance |
| autocrate | autocrat |
