The purpose of this study was to assess the relationship between parental responsivity and language outcomes after a 24-session language intervention in a sample of 62 toddlers with significant developmental delays and fewer than 10 spoken words. The data for this secondary analysis were taken from a longitudinal study that evaluated language outcomes after augmented or spoken language intervention (Romski et al., 2010). Instances of parental responsivity increased from pre-intervention to post-intervention and directive behaviors decreased slightly across all intervention groups. The results suggest a relationship between parental responsivity and expressive language outcomes in children with developmental delay who use augmentative and alternative communication. These findings support the role of parents as social partners in language interventions.