To better understand the associations between social activities and depressive symptoms in adolescents and young adults with autism spectrum disorder, this study utilized interpersonal theories of depression by accounting for both frequency of various social activities and perceptions of how well their time spent in these activities meet their needs and testing the indirect effects of loneliness in this association. To test these ideas, 321 participants who were recruited from the Simons Foundation Powering Autism Research for Knowledge (SPARK) research match registry and completed online measures of social activities, depressive symptoms, and loneliness. While the specific pattern was different for individual activities, it was found that those who felt that their current frequency of activities did not meet their needs had higher rates of depressive symptoms than those who felt they did meet their needs and that loneliness help to understand the indirect effects of the association between social activities and depressive symptoms. Overall, the findings suggest that how individuals feel about the time they are spending in social activities, such as with friends and in general social activities, could impact outcomes such as depression and loneliness.