- Iahsari (Melodic/Folk-metal)
- ‡ Icarian (Heavy/Folk-metal)
- Idaslet (Folk/Viking metal)
- ‡ Ifing (Black/Folk-metal)
- Ignis fatuu (Folk-metal)
- Ikael (Folk-rock)
- ‡ Illdåd (Folk-metal)
- ‡ Illuminandi (Christian Folk-metal)
- ‡ Impius Mundi (Medieval Rock)
- Incantatem (Folk-metal)
- Incursed (Epic Viking Metal)
- In Extremo (Folk/Medieval Rock)
- In Ora Mundi (Folk/Medieval Rock)
- Infinitas (Folk Heavy Metal)
- Ingrimm (Folk/Medieval Metal)
- ‡ Inis Gwenva (Black/Folk-metal)
- Irish Moutarde (Celtic Punk/Rock)
- Irminsul (Pagan/Viking/Folk Metal)
- ‡ Irrbloss (Black Viking/Folk-metal)
- Isakoatl (Folk/Heavy metal)
- Isatha (Folk-metal)
- ‡ Isengard (Folk Black Metal)
- Isenmor (Folk-metal)
- ‡ Ithilien (Melodic Folk-metal)
- Ivan Tzarevich (Epic/Folk Metal)
- Izmoroz (Pagan/Folk/Black Metal)