- Iberites
- Idanoceras
- Idiocycloceras
- Idiohamites
- Idoceras
- Ilowaiskya
- Imitoceras
- Imlayiceras
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- Inaigymnites
- Indigirites
- Indigirophyllites
- Indoceltites
- Indocephalites
- Indoceras
- Indojuvavites
- Indonesites
- Indoscaphites
- Indosphinctes
- Iniskinites
- Intoceras
- Intornites
- Intranodites
- Involuticeras
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- Inyoites
- Inzeroceras
- Iranoceras
- Irinoceras
- Isculites
- Isculitoides
- Ismidites
- Isohomoceras
- Isohoplites
- Isterites
- Istreites
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