Although some previous research suggests that various parent demographic and psychosocial variables may be associated with rates of attendance to and completion of behavioral parent training (BPT), findings are often limited by examining small samples of parents. The present study explores the connection between parent characteristics (ethnicity and SES), attendance, and attrition to group BPT among a sample (n = 177) of parents seeking treatment at a university-based clinic. Results highlight that parents’ self-reported ethnicity and SES were not associated with greater attendance or drop-out during group BPT. The findings are discussed in their relation for future research to examine the interactions between parent demographic and psychosocial characteristics on attendance and attrition during treatment in order to appropriately address barriers to treatment.