Objectives: Guidelines recommend antibiotic treatment for every episode of asymptomatic bacteriuria throughout pregnancy in order to reduce maternal and fetal complications. We evaluated intra- and post-partum, as well as puerperal maternal and neonatal outcomes of an untreated group of pregnant women with asymptomatic bacteriuria at term. Methods: This was a single center prospective cohort study. We enrolled women who came for labor or checkups, 37-42 wk gestation, with singleton, vertex presentation. On admission, women gave a urine sample; we compared maternal, obstetric and neonatal data from the pos. culture group to the neg. culture. Results: Among 248 pregnant women recruited, 205 neg. and 32 pos. urine cultures were collected. None of the women that participated in this study developed pyelonephritis during hospitalization or during the puerperium. No significant differences were detected between the two groups in terms of age, nulliparity, gestational age at delivery, length of hospitalization, birth type, intra- or post-partum fever, antibiotic treatment during labor or post-partum. Conclusions: No increased maternal or neonatal adverse effects were observed in women with untreated ASB detected at term.