Given the social purpose of sport clubs, an anticipated outcome of club participation is a sense of attachment to the university and campus community. However, the sport behaviors that contribute to club members’ social attachment are largely unknown. Therefore, this study sought to examine which sport club activities are related to university and member attachment. A survey was administered to 175 sport club members at a large public university in the United States. Using a multivariate analysis of variance, sport clubs with moderately low to high social inclusionary tactics reported significantly greater university attachment than clubs with low tactics. Additionally, clubs with high social inclusionary tactics reported significantly greater member attachment than clubs with low to moderately high tactics. No significant difference in attachment was found when accounting for clubs’ frequency of competition or travel. The findings support the use of formal socialization to enhance club members’ feelings of attachment.