This study is part of a larger Youth Participatory Action Research (YPAR) project engaging youth of color (YOC; aged 16-24 years) in a planning a multilevel health promotion campaign for a large safety net hospital. Analyses focus on youths' conceptualizations of antiracism, and their recommendations on how to facilitate an intentionally antiracist YPAR. We answer the following questions: (a) How do YOC engaged in a YPAR project conceptualize and define antiracism? and (b) How do youth and adult allies conceptualize an antiracist YPAR project and what strategies do they use and/or recommend to this end? We employed instrumental case study methods and thematic analyses to code project data sources. Findings indicate that youths' definitions of antiracism include elevating marginalized voices, actively resisting racism, incorporating an intersectional approach, and examining privilege, power, and positionality. YPAR members recommended strategies for creating an antiracist YPAR including prioritizing people of color in YPAR processes, creating space to acknowledge and process positionality and racialized dynamics, and engaging in ongoing education and dialogue. Moreover, both youth members and adult allies recognized that antiracist YPAR projects require time and resources to remain consistently antiracist, and such a goal can only be accomplished through a reiterative and reflexive process.