- R
- Raddoppiamento sintattico
- Raising
- Rank of stricture
- R colouring
- Received pronunciation
- Recruitment
- Reduced vowel
- Reduplication
- Regressive assimilation
- Release
- Release masking
- Rendaku
- Resolvability
- Resonance
- Resonant
- Response
- Retracted
- Retroflex
- Reynold’s number
- Rhotacism
- Rhotic
- Rhyme
- Rhythmic clipping
- Rise-fall
- Rising diphthong
- Roll
- Round
- RP