Background Despite the challenges associated with raising a child with autism spectrum disorder (ASD), many couples maintain satisfying relationships. However, it is not clear which factors couples prioritise as most important to this positive adaptation. Methods This study used Q-methodology to explore the viewpoints on factors most important to maintaining relationship satisfaction from the perspective of those experiencing it. Data from 43 caregivers raising a child with ASD were analysed using by-person varimax rotation factor analysis. Results Two key viewpoints were identified: 1) Building effective communication through openness, honesty and conflict resolution, and 2) Building a strong partnership by sharing parenting responsibilities. Conclusion Couples should be supported to strengthen communication processes and work in partnership to raise their child with ASD through family-centred interventions aimed at promoting relationship satisfaction.