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Team building has been defined as “a method of helping the group to (a) increase effectiveness,(b) satisfy the needs of its members, or (c) improve work conditions”(Brawley & Paskevich, 1997, p. 13). The primary purpose of the present study was to conduct a meta-analysis of studies using team building interventions in sport teams. A secondary purpose was to examine the influence of various moderator variables: study design (quasi-or non-experimental), source of data (published or unpublished), type of intervention (goal setting, interpersonal relations, adventure programs, omnibus), delivery (direct or indirect), length of intervention (< 2 weeks, 2-20 weeks,> 20 weeks), gender (male, female, mixed), sport type (interactive, individual, combination), and finally, skill level (high school, intercollegiate, post-intercollegiate). The dependent variables examined were: cohesion (task and social), performance, enhanced cognitions, roles, and anxiety. Standard literature searches produced 17 studies containing a total of 180 effect sizes. The effect sizes were subjected to the corrections suggested by Hedges and Olkin (1985). The overall average Hedges g was. 427 (p<. 001). Subsequent analyses indicated:(a) a moderate positive effect for both quasi-(. 408, p<. 001) and non-experimental (. 474, p<. 001) designs;(b) a moderate positive effect for published (. 385, p<. 001), along with a moderate to large positive effect for unpublished (. 539, p<. 001) studies;(c) a large positive effect for goal setting interventions (. 714, p<. 001) compared to a small positive effect for interventions incorporating a combination of strategies (. 161, p>. 05), and moderate …