This pilot study seeks to explore the relationship between interpersonal-level discrimination and heart rate (HR) in 11 young (ages 18-21), African American adults. Participants completed the 6-item stigmatization subscale of the Perceived Ethnic Discrimination Questionnaire-Community Version (PEDQ-CV). HR was assessed across a 24-hour monitoring period via an ambulatory watch and chest band. HR change from day to night was captured. An unadjusted Spearman correlation revealed an inverse association between stigmatization and HR change (r=-.655, p=.029). Specifically, increased stigmatization is correlated with a decreased difference in day to night HR change. This suggests greater stigmatization may be linked to more limited HR fluctuations across the day, a cardiovascular disease (CVD) risk factor. These findings provide insight regarding day to night fluctuations in HR as related to discriminatory experiences. Previous literature has examined the impact of interpersonal-level discrimination on ambulatory blood pressure which prospectively predicts CVD. However, the relation of discrimination to HR change from day to night, is understudied.