| alterner | alternate |
| Alternext | Alternext |
| alterné | alternate |
| Alterswil | Alterswil |
| Altes Museum | Altes Museum |
| Altesse | Highness |
| Althaea | Althaea |
| Altheim | Altheim |
| Althen-des-Paluds | Althen-des-Paluds |
| Althing | Althing |
| Althochdeutsch | Old High German |
| Althée | Althaea |
| Althütte | Althütte |
| Altiani | Altiani |
| Altichiero da Zevio | Altichiero |
| altier | arrogant |
| Altiero Spinelli | Altiero Spinelli |
| Altikon | Altikon |
| Altillac | Altillac |
| altimètre | altimeter |
| altimétrie | altimetry |
| Altingiaceae | Altingiaceae |
| Altiphrynoides malcolmi | Altiphrynoides |
| Altiplano | Altiplano |
| Altirhinus | Altirhinus |
| Altishofen | Altishofen |
| Altispinax | Altispinax |
| altitude | altitude |
| Altitude au-dessus du niveau de la mer | Above mean sea level |
| Altkirch | Altkirch |
| Altleiningen | Altleiningen |
| Altmark | German tanker Altmark |
| Altmühl | Altmühl |
| Altmünster | Altmünster |
| Altnau | Altnau |
| Altneuland | The Old New Land |
| alto | alto |
| Alto Malcantone | Alto Malcantone |
| Altocumulus | Altocumulus cloud |
| Altocumulus castellanus | Altocumulus castellanus cloud |
| Altocumulus lenticularis | Lenticular cloud |
| Altomünster | Altomünster |
| Altorf | Altorf |
| Altostratus | Altostratus cloud |
| Altran Technologies | Altran |
| Altria | Altria Group |
| Altrip | Altrip |
| Altrippe | Altrippe |
| altruisme | altruism |
