We examined whether the extent of perceived variability (i.e., consensus) among group members’ shared leadership ratings polarize group performances. Through using data from 39 classes in school settings, we explored the relationship between students’ shared leadership behavior and group performance as moderated by the extent of variability among group members’ shared leadership ratings. Study results, based on hierarchical multiple regression analyses, were consistent with the hypothesized conceptual scheme of moderation in that the slope of the relationship between shared leadership and group performance was stronger (and positive) for classes with high consensus than ones with low consensus. This indicates consensus among group members’ shared leadership ratings polarizing group performance.