Christians and Muslims were recruited from France (n ¼ 600), Britain (n ¼ 568), and the United States (n ¼ 1,176) to complete a survey assessing the relationship between argumentativeness and an individuals' self-construal. Correlation analysis revealed the relationships between self-construal, argumentativeness, and religiousness were significantly opposite those predicted. Hierarchical regression modeling results revealed national and religious identification to each have significant effects on the relationship between self-construal and argumentativeness. Religiousness did not have a significant effect on the relationship between argumentativeness and an individual's self-construal. Overall, an individual's culture was shown to significantly influence one's level of argumentativeness.