Youth restiveness within tertiary institutions poses serious challenges to academic activities, campus security, and social stability. This study investigated peer pressure and personality traits as determinants of youth restiveness among students of Kaduna State University. A cross-sectional survey research design was adopted. Data were collected using standardized questionnaires on peer pressure, personality traits, and restiveness. Data collected were analyzed using standard linear regression and multiple regression analysis. The study employed multi stage sampling to select 370 participants from age 16 to 35. Three scales namely; Perceived Peer Pressure Scale (PPPS), Ten Item Personality Inventory (TIPI) Perceived Peer Pressure Scale (PPPS), and Restiveness Factor Description were used. The findings revealed that peer pressure significantly predicted restiveness among youths in Kaduna State University (R = .179, R² = .032, F = 12.11, p < .05), indicating that peer pressure accounted for 3.2% of the variance in restiveness. Hypothesis two also found that personality traits significantly predicted restiveness (R = .226, R² = .051, F = 19.88, p < .05), accounting for 5.1% of the variance in restiveness. Hypothesis three indicated that peer pressure and personality traits jointly and significantly predicted restiveness among youths (R = .251, R² = .063, F = 12.32, p < .05), jointly accounting for 6.3% of the variance in restiveness. Personality traits emerged as a relatively stronger predictor of restiveness than peer pressure. The study concluded that peer pressure and personality traits are significant determinants of restiveness among youths in Kaduna State University. The study recommended that universities should strengthen counseling and psychological support services, implement peer mentoring programs, and develop intervention strategies aimed at improving emotional regulation, self-control, and positive peer interactions among students.