- I
- Iambic reversal
- Ideophone
- Idiolect
- Implicational universal
- Implosive
- Incus
- Indexical
- Ingressive
- Inner ear
- Initiation
- Initiator
- Intensity
- Inter-arytenoid muscle
- Interdental
- Intermediate phrase
- Intervocalic
- Intonation
- Intonation phrase
- Intrinsic allophone
- Intrusive r
- Inverse Square Law
- IPA
- Isochronicity
- Isogloss