• Charity sport events (CSEs) are a key revenue source for nonprofit organizations (NPOs) with large numbers of volunteers needed for success and cost-effectiveness. This study explored determinants of CSE volunteers' satisfaction, organizational commitment and intended future actions (CSE, other NPO activity/event volunteering, donating money). Relay for Life volunteers (N = 290) from one Australian state completed a cross-sectional survey. Significant pathways were found from socializing/enjoyment (β = 0.17), fighting cancer (β = 0.29), financial support (β = 0.21) motives and social norm (β = 0.23) to satisfaction; 52% variance was explained. Age (β = À0.09), survivorship (β = 0.09), region (β = 0.07), fundraising goal (β = 0.08), advocacy (β = 0.15), financial support (β = 0.25), social/enjoyment (β = 0.23) motives, social norm (β = 0.23) and satisfaction (β = 0.21) were linked with commitment; 63% variance was explained. Paths between satisfaction, commitment and intended future actions (CSE, NPO activity/event volunteering) were significant (βs = 0.17-0.43). Future targets to increase CSE volunteer satisfaction and commitment involve similar (social/enjoyment) and diverse (action-oriented) motives, with satisfaction and commitment key contributors to future actions supporting NPOs.