Educators, particularly those in the field of music, are susceptible to voice-related disorders due to their reliance on vocal delivery in their professional duties. This study investigates the impact of music teachers' mental health on their job performance, with a specific focus on the mediating role of voice fatigue among university music teachers. The study employs a quantitative and deductive approach, aligning with positivism research philosophy. Questionnaires were administered to gather data from music teachers in Malaysian universities, and the collected data underwent analysis using SPSS and PLS-SEM. Results indicate that compromised mental health in music teachers correlates with heightened voice fatigue, which, in turn, contributes to diminished job performance. Moreover, voice fatigue is identified as a significant mediator in the relationship between music teacher mental health and job performance. Additionally, vocal performance is revealed to be a noteworthy moderator in the connection between voice fatigue and suboptimal performance.