Affinity for aloneness (AFA; a tendency to enjoy time spent alone) among children and adolescents often has been viewed as negative, even though research on AFA among these age groups is scarce. Moreover, researchers have not accounted for the role that social anxiety (SA) might play in enjoying solitude. The purpose of this two-wave longitudinal study of children (N = 605, 47.76% female, Mage = 9.29 years) and early adolescents (N = 596, 51.51% female, Mage = 12.20 years) was to identify distinct groups based on responses to AFA and SA survey measures, to examine transitions between these groups over time, and to assess group differences in psychosocial adjustment (e.g., peer victimization, depressive symptoms) over time. Latent class analyses revealed four groups at T1 and T2 for both the children and early adolescents. Among these were normative (i.e., LowAFA/LowSA) and AFA (i.e., High AFA/LowModSA) groups. Transition analyses indicated that moving from the normative group at T1 to the AFA group at T2 was common among the early adolescents. In both the child and early adolescent samples, the AFA group did not differ from the normative group on any of the adjustment indicators at T2, controlling for scores at T1. These findings highlight the potentially benign nature of AFA among youth without high SA. Furthermore, they stress the importance of accounting for SA in studies of AFA in order to avoid the risk of pathologizing normal, potentially harmless behaviour. To begin, I would like to thank my advisor, Dr. Teena Willoughby, for her continuous guidance and support over these past few years. Thank you for believing in me and helping me realize what I am capable of-even during the toughest of times. Your friendliness, enthusiasm, and endless devotion to my learning are greatly appreciated. I would also like to thank my committee members, Dr. Michael Busseri and Dr. Drew Dane, for all of their assistance with this project. Your ideas and feedback are greatly appreciated and it's been a pleasure working with you both. To the members of the Adolescent Development Lab (both past and present), thank you for making me feel at home in the lab and always being there to lend a helping hand. Thank you for taking the time out of your busy schedules to edit my papers, listen to my presentations, help with my coursework, and so on. To any other friends from the Brock community, thanks for making this experience a memorable one. Last, but certainly not least, I'd like to thank my friends and family in Oakville (and beyond) for being so supportive and encouraging over these past few years. A special thank you goes to both Nikole and my parents for showing a continuous interest in my work and for being my number one supporters. I can honestly say that none of this would've been possible without you guys.