The paper offers an innovative exploration of the mediating role of psychological capital (PsyCap) in the relations between future orientation and self-advocacy among high-functioning adults on the autism spectrum. We posited that PsyCap, a composite of hope, self-efficacy, resilience, and optimism, serves as a crucial mediator of future orientation and self-advocacy. The sample comprised 40 high-functioning adults on the autism spectrum. Future orientation, self-advocacy, and PsyCap were significantly correlated among young adults with ASD. PsyCap was a mediator of the relations between future orientation and self-advocacy. The findings contribute to the understanding of psychological factors influencing self-advocacy and future orientation and have practical implications for interventions aimed at enhancing PsyCap to improve self-advocacy and future orientation in individuals with autism spectrum disorder.