| Indexpatient | index case |
| idempotent | idempotent |
| Indikation | indication |
| Indossament | endorsement |
| indexieren | index |
| indezent | dirty |
| indisponiert | indisposed |
| Krebspatient | cancer patient |
| Patient | patient |
| Infestation | infestation |
| Infixation | infixation |
| Integration | integration |
| undatiert | dateless undated |
| invertiert | inverted |
| ineffizient | inefficient |
| Department | department |
| inkompetent | incompetent |
| Index-Spamming | spamdexing |
| Rinderbraten | roast beef |
| Windschatten | slipstream |