A mix of qualitative and quantitative research methods was used to study the effect of gender on decision making. Gender differences in individual decision making in consumer behaviour, gender and values in connection with ethicalness of decisions, and HRM have been identified and discussed using existing literature. Gender differences in group decision making have been identified and debated since women and men tend to decide differently in groups as they would as individuals. Such example discussed was the compromise effect. Gender differences in group decision making have been identified and discussed from business and political aspect. The importance of gender equality in decision making has been outlined and researched in connection with gender differences in individual and group decision making. In the empirical part, the MDMQ was used to measure gender differences in decision self-esteem and gender differences in the tendency to rely on each of the four decision-coping patterns (vigilance, hypervigilance, buckpassing, procrastination) of individuals. The sample studied consisted of 125 participants (69 females and 56 males) of ages 20-30 years old. Results revealed that females' decision self-esteem is on average lower than males and that on average, females tend to rely more on each of the four decision coping patterns than males. Additional statistical analysis showed statistically significant gender differences in decision self-esteem and in the tendency to rely on hypervigilance and buckpassing. No statistically significant gender differences were found in the tendency to rely on vigilance and procrastination.