To meet emerging needs of the mentoring field and inform funders and policymakers about how to strengthen the mentoring movement, MENTOR has developed a Research Agenda outlining four key areas for future mentoring research. Many researchers, practitioners, and thought-leaders collaborated on this agenda, providing expertise and insight into ways we can inform and strengthen mentoring. This summary, which lists the four key priorities and action items identified as areas of focus, accompanies the full Research Agenda. The four key priorities are: (1) Increase research on the role of mentoring in supporting youth identity development and combating loneliness and isolation; (2) Study innovative strategies to expand natural mentoring relationships within systems and institutions; (3) Increase actionable research on mentoring that occurs in diverse programmatic settings; and (4) Invest in more research on the societal-level changes that are produced by mentoring relationships. [For the full research agenda, see ED614787.]