Both ongoing practice and the theory of interaction ritual chains imply the significance of the contribution that ritual makes to group solidarity, such as national identification. This contribution is in need of empirical examination as in this study, which surveyed 1,788 schoolchildren in Hong Kong, a special administrative region of China. The results show that, controlling for earlier national identification behavior (within the previous year) and other predictors, ritualized interaction in an activity for national cause (within the previous 6 months) manifested both linear and quadratic positive effects on current national identification sentiment. The effect was stronger for children who previously displayed lower national identification behavior. These results favor the use of ritual to promote national identification.