ABSTRACT Youth Participatory Action Research (YPAR) is oftentimes cited as a method guided by social justice principles to uplift youth voice and pursue youth priorities in research. However, to uphold these principles, YPAR researchers must address how youth and adults alike negotiate power differentials to be equal partners in research and scholarship. We explore YPAR power sharing through a reflexive thematic analysis of in-depth, semi-structured interviews (n = 42) and focus groups (n = 2) conducted at three timepoints (baseline, mid-point, and exit) with youth (n = 8) and adult (n = 6) researchers engaged in a YPAR exploring health equity at a large, safety-net hospital. Our analyses suggest that both youth and adult researchers negotiate power dynamics in a YPAR at every stage of the project. YPAR researchers made four recommendations to negotiate power: 1) preserve time for relationship building, 2) structure group expectations, 3) require training for adults working with youth of color, and 4) designate youth-only spaces. This study provides an in-depth analysis of youth and adult reflections on power across a YPAR project. Our findings indicate that YPAR requires significant investment in resources, including time to reflect on and process power, transparent and structured expectations, and ongoing training to uphold principles of YPAR.