This study examined a novel mentoring model, "near-peer mentorship," that supports the development of mentee and mentor, incorporates established principles of mentoring, and offers unique opportunities to integrate research and teaching in a science, technology, engineering, and mathematics (STEM) internship. Using qualitative methods, this model was examined from the perspectives of near-peer mentors and student mentees during a science education internship at the Walter Reed Army Institute of Research. Results revealed that this mentorship model contributed to personal, educational, and professional growth for near-peer mentors and increased the interest and engagement of students studying STEM. We discuss implications, limitations, and future directions.