| Insomnie | insomnia |
| Insignien | regalia |
| Insigne | insigne |
| Isomerie | isomerism |
| Dipsomanie | dipsomania |
| Ironie | irony |
| Oniomanie | oniomania |
| Sinfonie | symphony sinfonia |
| Insertio | minionette |
| Insasse | passenger resident patient inmate |
| Insolenz | boldness |
| Instanz | instantiate |
| Instinkt | instinct |
| Insulin | insulin |
| insofern | provided that |
| insolent | ill-mannered impertinent insolent |
| instabil | unstable instable |
| instant | instant |
| inständig | urgent |
| Konsommee | consomme |