This study investigated the relations among attachment, mother-child discourse, and theory of mind in a sample of 76 four-year-old children (mean age = 4.48 years; 36 boys). Mother-child conversations about a past event were coded for maternal use of elaborative discourse and mothers' references to mental states. Mothers completed the attachment q-sort and children completed four false-belief tasks. Results revealed that maternal conversational elaboration was a significant predictor of children's theory-of-mind performance, whereas maternal mental state references and attachment security were not. The findings provide further evidence for the importance of discourse in children's theory-of-mind development.