Parent language input is a well-established predictor of child language development. Multisensory attention skills (MASks; intersensory matching, shifting and sustaining attention to audiovisual speech) are also known to be foundations for language development. However, due to a lack of appropriate measures, individual differences in these skills have received little research focus. A newly established measure, the Multisensory Attention Assessment Protocol (MAAP), allows researchers to examine predictive relations between early MASks and later outcomes. We hypothesized that, along with parent language input, multisensory attention to social events (faces and voices) in infancy would predict later language outcomes. We collected data from 97 children (predominantly White and Hispanic, 48 males) participating in an ongoing longitudinal study assessing 12-, 18-, and 24-month MASks (MAAP) and parent language input (quality, quantity), and 18- and 24-month language outcomes (child speech production, vocabulary size). Results revealed 12-month intersensory matching (but not maintaining or shifting attention) of faces and voices in the presence of a distractor was a strong predictor of language. It predicted a variety of 18- and 24-month child language outcomes (expressive vocabulary, child speech production), even when holding traditional predictors constant: parent language input and SES (maternal education: 52% bachelor's degree or higher). Further, at each age, parent language input predicted just one outcome, expressive vocabulary, and SES predicted child speech production. These novel findings reveal infant intersensory matching of faces and voices in the presence of a distractor can predict which children might benefit most from parent language input and show better language outcomes.