Introduction: Having a mentor during residency is often linked to greater success in professional development. The present study compares changes in the percentage of residents with mentors in 1999 and in 2004, while considering current residents' perceptions of their mentors, with particular attention focused on what role race and gender might play in resident-mentor interactions. Method: A survey was administered to 4, 721 residents who took the 2004 Council on Resident Education in Obstetrics and Gynecology in-training examination. Data are reported for respondents from four racial categories: white, African American, Hispanic, and Asian/Pacific Islander. Results were compared to those of a similar survey administered in 1999. Responses were analyzed by chi-square analysis and univariate analyses of variance. Results: The response rate was 97%. Most residents (64.9%) reported having a mentor. White female residents were least likely to have a mentor. Compared to results from 1999, the percentage of residents with a mentor, and the percentage of residents with female mentors, has increased. For all residents, personal rapport, knowledge of the field, and similarity in professional interests were the three most important factors in choosing a mentor. The proportion of residents reporting explicit discussions about career options has declined since 1999. Discussion: Ethnic minorities are more likely than white residents to have a mentor, and to report that their mentors provide helpful advice. Although the proportion of residents with a mentor has increased since 1999, the quality of the mentoring relationship is meeting resident expectations but not exceeding them.