Where do individual differences in emotion regulation come from? This review examines theoretical and empirical evidence describing the role that personality traits play in shaping individuals' intrapersonal and interpersonal regulation styles. We define and delineate personality traits and emotion regulation and summarize empirical relations between them. Specifically, we review research on the Big Five personality traits in relation to each stage of Gross' (2015) extended process model of emotion regulation. In doing so, we document evidence concerning the relationships between personality traits and three key stages of emotion regulation, namely, identification (i.e., choosing which emotions to regulate), selection (i.e., choosing a broad regulatory approach), and implementation (i.e., adopting specific regulatory tactics). Finally, we make recommendations for future research that we hope will guide researchers in building a systematic understanding of how personality traits shape intrapersonal and interpersonal emotion regulation. (PsycINFO Database Record (c) 2020 APA, all rights reserved).