Perineal trauma is associated with short and long term maternal morbidity. Research has found that maternal position at birth can influence perineal trauma. However, no evidence examining specific maternal positions, including waterbirth and how these can influence incidence and degree of perineal trauma could be found. The evidence is important to help reduce trauma rates and improve information for women and midwives.To address this dearth in reliable evidence, a systematic review was conducted.Seven studies met the inclusion criteria. Compared to landbirth, waterbirth was found to cause an increase in perineal trauma. Kneeling and all-fours positions were most protective of an intact perineum. Allowing for different variables; sitting, squatting and using a birth-stool caused the greatest incidence of trauma.The findings of this review demonstrate further research is required around perineal guarding in alternative birth positions and how parity affects trauma rates with waterbirth in order that women may be advised appropriately. However, this review suggests findings that midwives can use when discussing alternative birth positions with women.