Teachers play an important role in expanding and supporting children's play and interactions with peers. This manuscript provides specific guidelines for interventions teachers can use to promote successful peer interactions in preschool settings. The strategies discussed include: (a) preparing the physical environment for play (e.g., toy selection, themes); (b) entering and exiting children's play gracefully, (c) using talk to promote play episodes and social interactions, and (d) selecting the most appropriate intervention strategies based on direct obeservation.