Accumulated research indicated that receiving mentor support benefits protégés’ career development and success. As such, the extent of support mentors provided impacts protégé career outcomes. The current study examined the relationships between perceived organizational support (POS), motivation to mentor, and mentoring provided. Moreover, this study investigated the moderating roles of organizational citizen behavior and self-efficacy on this relationship. The two-wave data from 176 mentors were collected. The results demonstrated that the POS was related to mentoring motivation, and mentor motivation positively relates to the provision of mentoring support. In addition, the relationship between POS and mentoring support was mediated by mentoring motivation. Furthermore, both organizational citizenship behavior (OCB) and self-efficacy strengthen the relationship between motivation to mentor and mentoring support such that this relationship was more positive when either OCB or self-efficacy is high. Theoretical and practical implications of the findings are discussed.