| in- | un- |
| In-Grid | In-Grid |
| In-N-Out Burger | In-N-Out Burger |
| in-octavo | octavo |
| in-quarto | quarto |
| Ina | Ina River |
| inabordable | unapproachable |
| inaccentué | unstressed |
| inacceptable | exceptionable |
| inaccessibilité | inaccessibility |
| inaccessible | impervious |
| inaccoutumé | unused |
| inachetable | unbuyable |
| inachevé | incomplete |
| inachèvement | incompleteness |
| inactif | idle |
| inaction | inactivity |
| inactiver | inactivate |
| inactivité | inactivity |
| inadaptation | maladjustment |
| inadapté | misfit |
| inadmissible | unacceptable |
| inadvertance | oversight |
| inadéquat | inadequate |
| Inagua | Inagua |
| Inaki Isasi | Iñaki Isasi |
| inaliénable | inalienable |
| inaltérable | changeless |
| inaltéré | unaltered |
| inamical | chilly |
| inamovible | irremovable |
| inanimé | lifeless |
| inanition | inanition |
| inanité | inanity |
| inaperçu | unnoticed |
| inapplicable | inapplicable |
| inapproprié | befit |
| inapte | unfit |
| inaptitude | disability |
| inarrêtable | unstoppable |
| inattaquable | unimpeachable |
| inattendu | unforeseen |
| inattentif | absent |
| inattention | abstraction |
| inattentionné | unaffectionate |
| inaudible | inaudible |
| inauguration | inauguration |
| inaugurer | start |
| inauthentique | fictitious |
| inaverti | unwarned |
| Inayatullah Shah | Inayatullah Khan |
| Inazō Nitobe | Nitobe Inazō |
| InBev | InBev |
| Inca | Inca Empire |
| Inca Garcilaso de la Vega | Inca Garcilaso de la Vega |
| incalculable | incalculable |
| incandescence | incandescence |
| incandescence prolongée | afterglow |
| incandescent | in glow |
| incantation | abracadabra |
| incapable | unfit |
| incapable de travailler | disabled |
| incapacité | disability |
| Incapacité de travail | Industrial disablement |
| incarcération | imprisonment |
| incarcérer | incarcerate |
| Incardination | Excardination and Incardination |
| incarnat | carnation |
| incarnation | incarnation |
| incarner | epitomize |
| incassable | unbreakable |
| incendiaire | rabble-rousing |
| Incendicendio | Fire |
| incendie | fire |
| incendie criminel | arson |
| incendie de forêt | forest fire |
| incendie volontaire | arson |
| incendier | burn off |
| Incertae sedis | Incertae sedis |
| incertain | dubious |
| incertitude | doubt |
| incessamment | continuously |
| incessant | uninterrupted |
| inceste | incest |
| incestueux | incestuous |
| inchangé | unchanged |
| Incheon | Incheon |
| Incheon Munhak Stadium | Incheon Munhak Stadium |
| INCI | International Nomenclature of Cosmetic Ingredients |
| incidence | impact |
| Incidence rasante | Grazing incidence |
| incident | incident |
| Incident de détention de la famille Muamar | Muamar family detention incident |
| incident de garde-robe | wardrobe malfunction |
| Incident de Kecksburg | Kecksburg UFO incident |
| Incident de Mantell | Mantell UFO Incident |
| Incident de Mrkonjić Grad | Mrkonjić Grad incident |
| Incident de Namamugi | Namamugi Incident |
| Incident de Pétritch | The incident at Petrich |
| Incident de Rendelsham | Rendlesham Forest Incident |
| Incident de Roswell | Roswell UFO incident |
| Incident de Sakai | Sakai incident |
| Incident de Shag Harbour | Shag Harbour incident |
| Incident de Venlo | Venlo Incident |
| Incident du Dogger Bank | Dogger Bank incident |
| Incident du Golfe de Syrte | Gulf of Sidra incident |
| Incident du Mayagüez | Mayagüez incident |
| Incident du pont Marco Polo | Marco Polo Bridge Incident |
| Incident du USS Liberty | USS Liberty incident |
| Incident matériel | Hard fault |
| Incident technique | Technical hitch |
| Incident Vela | Vela Incident |
| Incidentalome | Incidentaloma |
| Incidents du Golfe du Tonkin | Gulf of Tonkin Incident |
| Incidents violents | Angry scenes |
| incinérateur | incinerator |
| incinération | cremation |
| incinération des déchets | incineration of waste |
| incinérer | burn |
