This study investigated interpersonal workplace aggression, honesty-humility, and deviant workplace behaviour among telecommunications industry employees. A cross-sectional design using a survey design with the use of a standard questionnaire was employed to collect data from respondents. A multistage sampling technique was used through convenience and a simple random sampling to select 384 respondents of which 320 were retrieved and analyzed. The Stressor-Emotion model and the Social Exchange Theory underpinned the study. The study tested three hypotheses through correlation, simple regression, and the Baron and Kenny Process Marco version 3.5. The findings revealed a significant positive relationship between interpersonal workplace aggression and deviant workplace behaviour. In contrast, no significant relationship was observed between honesty-humility and deviant workplace behaviour. Notably, the study identified that honesty-humility moderated the relationship between interpersonal workplace aggression and deviant workplace behaviour. In light of these results, the study recommends that management should consider implementing training programs aimed at educating employees on these three constructs. Additionally, human resources management should prioritize the assessment of these qualities when screening potential candidates during the recruitment process. The study also discusses its implications, limitations, and offers directions for potential future research endeavors.