<p>Intergroup dialogue (IGD) is an experiential learning approach conducted in small-group settings to foster sustained dialogue among individuals with diverse identities. While the effectiveness of IGD has been demonstrated in Western cultures, it has not been proven in non-Western cultures. This study evaluated the effectiveness of a seven-session IGD in promoting social justice capacities among 72 South Korean undergraduate and graduate students. A mixed-methods, non-randomized controlled clinical trial evaluated the effectiveness of IGD by (a) conducting pre-and post-tests and (b) analyzing simple qualitative data using a modified consensual qualitative research methodology to capture meaningful moments and changes in each session. After controlling for pretest scores, analysis of covariance revealed statistically significant increases in critical motivation, <i>F</i>(1, 88) = 6.37, cultural openness, <i>F</i>(1, 88) = 9.40, cultural empathy, <i>F</i>(1, 88) = 4.09, cultural knowledge, <i>F</i>(1, 88) = 4.39, and a significant decrease in prejudice, <i>F</i>(1, 88) = 5.23. qualitative findings revealed the factors and barriers to facilitating the changes in perceptions and attitudes. The findings suggest that historical background of diversity and cultural values of South Korea, as well as on other non-Western cultures, must be considered when implementing IGD to realize its effectiveness.</p>