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CONTEXT Youth sport specialization may be associated with physical literacy and physical activity in young adulthood. The purposes of this study were to compare young adult (18-25 y) physical literacy and physical activity by high school sport specialization status and to examine the relationship between current physical activity and physical literacy. DESIGN Retrospective, cross-sectional study design. METHODS Participants were recruited from ResearchMatch, university classes, and social media posts. Participants (N = 172; aged 22.1 [2.1] y; 80.1% female) completed the following anonymous surveys on REDCap to assess: demographics and injury history, sport specialization, physical literacy (PLAYself), and physical activity (Godin Leisure-Time Exercise Questionnaire). RESULTS When controlling for age, there were no statistically significant differences in physical literacy (F2,166 = 2.02, P = .14) or moderate to vigorous physical activity (F2,161 = 0.24, P = .79) between sport specialization groups. There was a moderate, positive relationship between physical literacy and physical activity (r = .33, P < .001). CONCLUSIONS Young adult physical literacy and physical activity were similar regardless of youth sport specialization level. Young adult physical literacy was positively associated with physical activity. Future studies should consider physical literacy as a possible correlate of physical activity among young adults.