This study investigates the pivotal role of trust in business coaching and mentoring through a mixed-methods research design involving 200 coaches. The research addresses fundamental questions related to trust in these professional relationships: What is the nature and significance of trust? How is it cultivated and sustained? What is its influence on the coaching and mentoring processes and their outcomes? By employing both quantitative surveys and qualitative interviews, the study reveals that higher levels of trust significantly enhance coaching outcomes. The quantitative analysis shows a strong positive correlation between trust and coaching success, identifying trust in a mentor as a key predictor of a coaching relationship's effectiveness. Qualitative insights further uncover the foundational elements of trust, including transparency, demonstrated competence, and ethical behavior. The findings underscore the crucial importance of trust in business coaching and mentoring, offering practical recommendations for practitioners to enhance coaching performance and client satisfaction. This study contributes to the growing body of literature on the subject and suggests potential directions for future research across various business sectors and organizational contexts.