- ian douglas smith
- icing
- icon
- iconic
- iconoclasm
- icteria virens
- ictalurus punctatus
- icteridae
- ichthyolatry
- icterus
- ictic
- ictiobus niger
- ictonyx striata
- ictus
- icu
- icy
- id
- id al_adha
- id al_fitr
- id est
- id card
- ida
- ida minerva tarbell
- idaho
- idahoan
- ideal
- ideal solid
- ideal woman
- idealisation
- idealise
- idealism
- idealism—the doctrine that only intelligence has reality (and not the objects exterior to us)
- idealist
- idealistically
- idealistic
- idealize
- idealization
- ideally
- idealized
- idealogue
- ideate
- ideas
- ideation
- identical
- ideational
- idem
- identical twin
- identifiable
- identification
- identification mark