This study set out to examine native Dutch adolescents' tolerance (N = 1,139) of Muslim immigrants in relation to the endorsement of assimilation, national identification, and contact with ethnic minority peers. The focus was on two dimensions of tolerance: the acceptance of practices by Muslim actors, and Muslims persuading co-believers to engage in the same practices. Tolerance was found to be higher for the practices than for persuading others. Higher endorsement of assimilation was related to lower levels of tolerance, and this relation was stronger for higher compared to lower national identifiers. Assimilation mediated the positive relationship between intergroup contact and tolerance. These effects did not differ for the two dimensions of tolerance. The implications of these findings are discussed.