Teen motherhood is a major concern in the world. The purpose of this study was to investigate the influence of extroversive personality traits on social adjustment among secondary school re-admitted teen mothers in Rarieda Sub-County of Kenya. Eysenck’s personality traits theory and Social comparison theory were used in this study. The study adopted a concurrent triangulation design. The study’s target population of 217 consisted of all re-admitted teen mothers, 34 teacher counsellors and 34 deputy principals in the 34 day mixed secondary schools in Rarieda Sub-County. The sample size consisted of 149 teen mothers, 10 teacher counsellors and 10 deputy principals. Data collection tools were Eysenck personality questionnaire, social adjustment questionnaire and interview schedules. Validity was ensured by the assistance of the two university supervisor’s judgement while reliability was ensured by the internal consistency technique and Cronbach’s coefficient of r =0.85 was reported. Quantitative data was analysed by Pearson correlation while qualitative data was analysed using thematic analysis. The study revealed a strong negative correlation of -0.889 between introversive personality traits on social adjustment among re-admitted team mothers. The study recommended that Teacher Counsellors should adopt appropriate therapy techniques to assist the introverts and neurotic teen mothers adjust in school