Purpose: Given the dynamic and fast-evolving labour market, developing students' employability competences has become of utmost importance for higher education institutions. The ability to reflect is essential to develop these competences, as it helps students to identify their learning needs and make plans for further development. However, reflective abilities are not easy to acquire and students need guidance to help them reflect. Therefore, mentoring is often used as an instructional approach to stimulate students to reflect. Empirical evidence on the relation between mentoring and employability competences is scarce, and the mediating role of reflection especially has rarely been researched. Consequently, the present study aims to investigate this mediating relationship, employing a pre-test post-test design. Design/methodology/approach: Questionnaire data were collected from students before and after participation in four similar 1-year mentoring programmes in higher education within the Netherlands and Belgium (n = 160). Findings: The path analysis demonstrated that, first, trust and availability, autonomy support and empathy were significantly related to students' employability competences. Secondly, autonomy support and similarity were significantly related to students' critical reflection. Thirdly, critical reflection was significantly related to students' employability competences. Last, reflection partially mediated the relationship between mentoring (autonomy support and similarity) and employability. Originality/value: To the best of the authors' knowledge, this study is the first attempt to demonstrate that mentoring programmes in higher education enable students to reflect and, in turn, develop their employability competences. Furthermore, it provides mentoring programme directors and mentors with concrete guidelines for developing students' reflection and employability competences.