The study was to determine the relationship between religious self-regulation of students and their attendance on Sunday Eucharistic celebration using the concept of extrinsic motivation in terms of religious identified self-regulation and religious introjected self-regulation. The study used descriptive research design and explanation research. In order to carry out the study, questionnaires were used and adapted from SRQ_R (self-regulation Questionnaires: Religious) made by SDT or self-Determination Theory (n.d) and Ryan, Rigby, & King, (1993). The respondents of the study were 490 Senior High School students from Ilocos Region, Philippines. The study found that religious identified self-regulation and religious introjected self-regulation is high. However, taken as a whole, there was no correlation between religious self-regulation and attendance on Sunday Eucharistic celebration. But taking it singly, there is a correlation between religious identified self-regulation and attendance on Sunday Eucharistic celebration.