This study aims to examine how social undermining restrains employee creativity. Specifically, an attempt is made to investigate the serial mediating role of interpersonal distrust and knowledge hiding in the relationship between social undermining and employee creativity. This study used purposive sampling to draw 309 employees from the advertising agencies of Pakistan. We used a time-lagged research design to collect the data on the measures at three different points in time. A self-administered questionnaire was used for the collection of data. We followed variance-based structural equation modeling (SEM) to conduct the data analysis in SmartPLS. Our study results indicated a significant negative association between social undermining and employee creativity, while serial mediation analysis showed that interpersonal distrust and knowledge hiding partially mediated the above linkage. This study’s findings contribute to the literature on employee creativity by identifying and testing social undermining as an interpersonal inhibitor factor that impairs employee creativity, and this relationship is serially mediated by interpersonal distrust and knowledge hiding. This study offers valuable insights for the managers of advertising agencies.