| Influenz | influence |
| Infant | infante |
| Influenza | flu influenza grippe grip |
| Infos | lowdown |
| Einfuhr | import |
| Infekt | infection |
| Inferenz | inference |
| Inferno | inferno |
| Infix | infix |
| Info | info |
| infam | infamous |
| infaust | infaust |
| infra- | infra- |
| Unfug | devilry mischief |
| Befund | finding results feature |
| Fund | find discovery invention |
| Funk | radio broadcast funk |
| Fünf | five |
| fünf | five |
| Impfung | vaccination |