Bambassi has 5 vowels: /a, e, i, o, u/. The vowels have lengthened forms, and Bambassi has contrastive vowel length.
| Bilabial | Alveolar | Postalveolar | Palatal | Velar | Glottal | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| plain | ejective | plain | ejective | plain | ejective | |||||
| Stop | voiceless | p | pʼ | t | tʼ | k | kʼ | |||
| voiced | b | d | g | |||||||
| Affricate | t͡sʼ | (t͡ʃ) | ||||||||
| Fricative | voiceless | s | ʃ | h | ||||||
| voiced | z | |||||||||
| Nasal | m | n | ŋ | |||||||
| Approximant | l | j | w | |||||||
| Flap | ɾ | |||||||||