Background: Maternal childbirth dissatisfaction has short-and long-term negative effects on the mothers' health and life, as well as on relation with her child and family. Due to lack of studies in Iran and other counties, we aimed to determine pre-and during-labour predictors of low birth satisfaction. Methods: Seven hundred women with low risk singleton pregnancy participated in this prospective analytical study. The participants were hospitalized for vaginal delivery with fetus in cephalic presentation and gestational age of 37 0-41 6 at two teaching centers in Tabriz (Iran). Woman characteristics, anxiety state (using Spielberger inventory) and dehydration were assessed at cervical dilatation of 4-6 cm. Iranian (Persian) birth satisfaction scalerevised was applied 12-24 h after birth. Multiple linear regression was used to determine the predictors. Results: Excluding 26 women who were outliers, 674 women were analyzed. The mean birth satisfaction score was 23.8 (SD 6.5) from an attainable score of 0-40. The during-labour predictors of low birth satisfaction score were severe and moderate anxiety, labour dystocia, insufficient support by staff, vaginal birth with episiotomy and tear, emergency cesarean section, labour induction and labour augmentation with oxytocin, and woman dehydration. The pre-labour predictors included being primiparous, sexual and emotional violence during pregnancy, gestational age of 40 0-41 6 , preference for cesarean section, no attendance at pregnancy classes, and insufficient household income. The proportion of the variance explained by the during-labour variables was 75%, by pre-labour variables was 14% and by overall was 76%. Conclusions: The controllable during-labour predictors explains most of the variance of the satisfaction score. It seems that responding to women's physical and psychological needs during labour and applying less interventions could improve women's childbirth satisfaction.