Introduction: The present study explores the association of adverse childhood experiences with impulsivity and functional identity among Pakistani adults. Methods: In this cross-sectional study, 260 Pakistani medical students aged 18 and above were approached. A consent form, a questionnaire on sociodemographic characteristics, and an English versions of the Adverse Childhood Experiences (ACE) scale, Functions of Identity scale (FIS) and Barratt's Impulsiveness Scale (BIS-11) was employed in this study. All data were analyzed in SPSS v. 20. Results: A total of 122 (52.6%) of respondents had experienced at least one adverse childhood experience. According to linear regression analysis, ACE scores were significantly associated with increasing age, increasing order in birth, lower scores on functional identity structure and non-planning impulsivity, and higher scores on future (functional identity) and motor impulsivity. Conclusions: A high proportion of Pakistani medical students reported adverse childhood experiences, which lead to impulsive behaviors and poor functional identities.