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Background: The objective of this pilot study was to examine demographic, health, behavioral, and social cognitive correlates of perceived worksite environmental support for physical activity (PA) in middle-age adults. Methods: A convenience sample (N = 173) of University employees in the Southeastern U.S. (mean age = 45) was surveyed using an internet-based questionnaire. Measures included perceived worksite environmental support for PA, self-reported minutes of moderate-to-vigorous PA, self-regulation, self-efficacy for walking transportation, PA social support, health status, and sociodemographic items. Bivariate and hierarchical regression analyses were computed to examine correlates of perceived worksite environmental support for PA. Results: Bivariate analyses revealed male gender, self-reported moderate-to-vigorous PA, self-regulation use, self-efficacy for walking transportation, and PA social support from friends and family as independent, positive correlates of perceived worksite environmental support for PA (P ≤ .05). Hierarchical regression analyses revealed self-regulation use and PA social support from friends as independent, positive correlates of perceived worksite environmental support for PA (final model R² = 20.30%, P ≤ .0001). Conclusions: Although causality cannot be determined, these pilot findings support a social cognitive approach. Further exploration of these relationships is warranted and health educators should consider perceptions of physical and social environments in planning future worksite PA promotion programs. [ABSTRACT FROM AUTHOR]