Introduction: Postpartum urinary retention (PUR) is defined as being unable to void completely after delivery .The covert PUR is described as “a post void residual bladder volume (PVRV) of ≥ 150 ml after spontaneous micturition, verified by ultrasound or catheterization”.Aims & Objectives:The aim was to identify high risk factors for covert postpartum urinary retention after vaginal delivery by ultrasonography and objectivesare to study theprevalence of covert PUR and to assess the associated obstetric variables.Material & Methods: In this prospective observational descriptive study 250 postpartum women were taken who delivered vaginally without urinary symptoms.. The post void residual volume (PVRV) wasmeasured by ultrasonography urinary bladder region at the time of discharge. PVRV < 150 ml was considered as normal and treated asCONTROL GROUP; PVRV ≥ 150 ml was considered as STUDY GROUP.For all participants, maternalcharacteristics such as age and parity; gestational age at onset of labor; induction of labor, duration of second stage of labor; and episiotomy; were collected and statistically analysed.Results: The characteristics of the patients with or without covert PUR were compared gestational weeks (p = 0.043),induction of labour (p=0.003), duration of second stage of labor (p value <0.001); and need for episiotomy (p=0.003) werefound to be statistically significant between patients with PVRV under 150 mL and ≥150 mL. Age and parity were not foundto be statistically significant.Conclusion: In this study gestational weeks, induction of labour , duration of second stage of labor and need for episiotomy were identified as risk factors for covert post partum urinary retention. This study may help us to identify a high risk group for postpartum covert urinary retention.