Two studies were conducted to examine how perceptions of support for mentoring relate to mentoring attitudes and outcomes for both proteges and mentors, over and above established predictors. In study 1, proteges provided information on their perceptions of support for mentoring and mentoring received. As expected, perceived management support for mentoring was positively related to career-related and psychosocial support; and perceived mentor accountability for mentoring was negatively related to mentoring problems. In study 2, we examined mentors' perceptions of support for mentoring in relation to their willingness to mentor others in the future and the extent to which they viewed their current relationship as complementary. Mentors' perceptions of management support for mentoring were positively related to their belief that mentoring relationships were mutually beneficial. However, consistent with theories of self-determination, as mentors' perceptions of their own accountability in the relationship increased their willingness to mentor others in the future decreased. Implications for mentoring theory, future research, and applied practice are discussed.