Background: In families of individuals with autism spectrum disorder (ASD), the added difficulties they face may influence their perception of family quality of life (FQoL). It is important to identify factors which foster their perceived wellbeing and are susceptible to intervention. Our aim was to explore the association between mindful attention and FQoL in these families controlling their perceived social support. Method: Ninety-six parents of people with ASD were evaluated using the Mindful Attention and Awareness Scale (MAAS), the Support Questionnaire for Parents with Children with Disability, and the Spanish Family Quality of Life Scale for families with underage members with intellectual and developmental disabilities. Results: Multiple regression analyses revealed that high levels of mindful attention positively predicted FQoL after controlling the influence of social support. Conclusions: Practical implications are discussed in terms of family support interventions. We conclude that mindful attention interventions may be useful for families with children and adolescents with ASD to improve their FQoL.