Objective: Our research article aimed to determine if six-month mortality amongst hepatitis B and C patients undergoing cardiac surgery varied according to gender, post-operatively. Secondarily, we highlighted the significant differences among the two genders in their pre-operative, operative, and post-operative characteristics and deduced significant predictors of mortality. Methods: We obtained approval from the International Review Board of the Dow University of Health Sciences, and conducted a retrospective study targeting hepatitis B and C patients who had undergone cardiac surgery between January 2013 to October 2018 at the Ruth Pfau Civil Hospital, Karachi, Pakistan. The data was analysed using the Statistical Package for Social Sciences (Version 20.0). The population was divided into two groups, based on gender. Chi-squared test was used to compare categorical variables and odd ratios with 95% confidence interval were also computed. Differences in continuous variables were assessed using independent T-test or Mann-Whitney U test. Results: There was no significant difference in six-month mortality between the genders, with a 22.5% mortality in males and 20.0% mortality in females. Post-operatively, males had higher creatinine (p=0.003) levels but females tended to have a longer ward stay (p=0.032). On multivariate logistic regression, duration of intubation (aOR=1.131, 95% CI: 1.002-1.275), cardiopulmonary bypass time (aOR=1.030, 95% CI: 1.002-1.059) and duration of ward stay (aOR=1.100, 95% CI: 1.031-1.175) were found to be significant predictors of mortality. Conclusion: There is no association between six-month mortality and gender among hepatitis B and C patients undergoing cardiac surgery. Additionally, duration of intubation, cardiopulmonary bypass time and duration of ward stay are significant predictors of six-month mortality.