Workplace bullying is endemic in modern workplaces. It is capable of disrupting employeepsychological ill-health which create pathways to substance abuse, in turn exposes individuals tobecome victims or perpetrator of various crimes. The study investigates the extent to whichworkplace bullying determine the experience of psychological distress and also, explored the roleplayed by resilience and social support as possible mediators of the outcome of psychologicaldistress. The study sampled a total number of 259 participants from non-academic staff of theUniversity of Lagos, Nigeria. The participants responded to the Negative Actions QuestionnaireNAQ which was used to measure workplace bullying, Kessler Psychological Distress Scale (K10)which assessed psychological distress, Connor-Davidson Resilience Scale CD-RISC whichmeasured Resilience, and multidimensional scale of perceived social support (MSPSS) whichmeasured social support. The result showed significant positive correlation between workplacebullying and psychological distress. Workplace bullying explained 32% variance in psychologicaldistress scores. Resilience was negatively related with psychological distress, it explained 11%variance in psychological distress score. Social support was negatively correlated with psychologicaldistress. However, it was not a significant mediator, explaining only 1% of variance in psychologicaldistress score. Workplace bullying has significant impact on the wellbeing of employees.Organizations should do all they can to mitigate its occurrence in their work environment and alsoemployees could also benefit from resilience training aimed at helping them reduce incidences ofvictimization. Social support from both within and outside the workplace can also play a role inreducing the impact of negative events at the workplace.