Background: Preterm birth (PTB) complications are the leading cause of death among neonates globally1 . It remains one of the most serious problems in obstetrics care globally. In Ethiopia preterm delivery is a direct cause of 28% newborn deaths2 . it is the second leading cause of death next to pneumonia in children aged <5 years and the single most important cause of death in the first month of life3 . Defining risk factors for prediction of preterm birth will help to identify at-risk women which allows initiation of risk-specific treatment. Objective: The objective of this study was to assess the proportions and associated factors of preterm delivery in governmental hospitals in Bahirdar city, Northwest Ethiopia from 01/03/2021 to 30/05/2021 GC Method: Institutional based cross-sectional study design was conducted at Felege Hiwot comprehensive specialized hospital, Tibebe Ghion specialized hospital and Addisalem primary hospital. The data were processed & analyzed using SPSS program version 23 & the analyzed data was described using frequency tables, graphs and figures accordingly. Result: In this study the proportion of preterm birth was 17.1%. Associated factors: hypertension [AOR=4.200, 95% CI: 1.747,10.096)], PROM [AOR=2.584, 95% CI: (1.353,4.935), less than 4 ANC [AOR=4.836, 95% CI: (2.584,9.050)], Twin delivery [AOR= 6.383, 95% CI: (2.035,20.024)] and APH [AOR=7.101, 95% CI: (2.836,17.782)]. Conclusion: The proportion of preterm delivery was high when compared to the world wide, to Africa and national figures. Presence of hypertension, antepartum hemorrhage, PROM, less than 4 ANC visit and multiple gestation were found statistically significant for the occurrence of preterm delivery. Key words: preterm birth, proportion, Bahirdar city, cross sectional study