- Ilbono
- Illorai
- Irgoli
- Isili
- Iglesias
- Ittireddu
- Ittiri
- Ingurtosu
- Is Argiddas
- Is Carillus
- Is Meddas
- Is Traias
- Is Urigus
- Isola dei Cavoli
- Isola del Toro
- Ìsola di Sant'Antìoco
- Italcementi
- Is. Arenas
- Is Corrias
- Is Forredus
- Is Molas
- Is Morus
- Is Orrus
- Is Perrizzonis
- Is Pisus-Is Concias
- Is Punteddus
- Istituto Religioso
- Is Tanas
- Iscra e Voes
- Isola Ruia