The aim of the present study was to develop and provide a preliminary evaluation of a social-skills-based early intervention program specifically designed to assist extremely inhibited preschoolers. Participants were a sample of n = 522 extremely inhibited preschool-aged children, who were randomly assigned to either the "Social Skills Facilitated Play" (SST) or "Waitlist Control" (WLC) condition. As compared to wait-list controls, extremely inhibited children who participated in the SST-facilitated play program sessions demonstrated a significantly greater post-intervention decrease in observed socially wary behaviours and a significantly greater increase in social and socially competent behaviours at preschool. Results are discussed in terms of the importance of developing and refining early intervention programs for extremely inhibited young children. (Contains 1 figure and 2 notes.)