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A neglected area of sociological investigation is the relationship between ethnic factors and suicide mortality. This paper explores this topic among immigrant-ethnic groups in Canada. Three hypotheses are evaluated: (1) the assimilation thesis, which posits that the greater the degree of social assimilation among immigrant-ethnic groups, the greater the suicide rate; (2) the ethnic community integration explanation, which predicts that ethnic groups with strong degrees of community cohesiveness share reduced odds in their incidence of suicide; and (3) the socioeconomic hypothesis, which accounts for observed differences in suicide on the basis of discrepancies in socioeconomic well-being. The results of a multiple regression analysis provide empirical support for hypotheses (1) and (2). The findings are discussed in the con-text of multiculturalism and the propensities for sociocultural groups to commit suicide dur-ing the processes of assimilation and adjustment to the larger society