abstract-this study aimed to investigate birth order effect on personality and academic performance amongst 120 malaysians. Besides, it also aimed to examine the relationship between personality and academic achievement.Thirty firstborns, 30 middle children, 30 lastborns, and 30 only children, who shared the mean age of 20.0 years ( SD=1.85), were recruited into this study. Participants' Sijil Pelajaran Malaysia (SPM) results were recorded and their personality was assessed by Ten Item Personality Inventory (TIPI). Results indicated that participants of different birth positions did not differ significantly in terms of personality and academic performance. However,Pearson's Correlation showed that extraversion correlated positivery with academic performance. Keywords-birth order ; Personality ; academic achievement