Background and objectives <p>Most women experience sphincter injury during vaginal delivery. OASIS is the leading cause of anal incontinence in women. The objective of this study was to compare the incidence of OASIS in two groups after employing&#xa0;two different manual perineal protection manoeuvres during vaginal delivery.</p> Methods <p>Our study was carried out in a tertiary care hospital. Over the course of the 18-month trial period, 1272 women who satisfied the inclusion criteria made up the study population. Participants were divided into two groups. Group A received perineal protection in accordance with standard protocol, whereas Group B received perineal support as per the Norwegian method. Data were recorded and analysed for the incidence OASIS post-delivery and &#xa0;the&#xa0;associated risk factors.</p> Results <p>In our study, 2.4% of women experienced OASIS. The incidence of OASIS was found to be 3.5% in Group A and 2.4% in Group B. When comparing the two groups, there was a 2.1% absolute reduction and a 60% relative reduction in the incidence of OASIS. However, the distribution of degree of perineal injuries in both groups did not differ statistically (<i>p</i> = 0.148).</p> Conclusions <p>Our study concluded that the Norwegian method of perineal support significantly reduced the incidence of OASIS during vaginal delivery. </p>