Active commuting (AC; walking or biking) to work is associated with improved physical and mental health, decreased chronic disease morbidity and mortality, less pollution and greater economic spending, though rates of AC remain low in the US. Workplaces have the potential to improve AC participation, though evidence is limited in this area. PURPOSE:To examine if workplace influences are associated with AC participation. METHODS:A volunteer sample of employees at a large university were recruited for an online survey about their travel habits. Participants responded about the number of trips to campus using different modes of travel (walk/bike/drive/bus), demographics, and the physical and social environments for AC. Walk and bike trips were summed to determine AC participation. Basic statistics described the sample. Pearson correlations and t-tests examined relationships between AC participation with social and environmental influences. A multivariate regression analysis predicted AC participation. RESULTS: The sample (n=551) was predominately female (75.7%), Caucasian (95.6%) with a mean age of 45.8±11.5 y. Participants reported .86±2.6 AC trips/week. AC trips were positively associated with perceiving that your coworkers AC (r=.32, p<0.001). Parking availability (r=-.23, p<.001) and cost (r=-.17, p=.04) and bike parking availability (r=.24, p<.001) were associated with AC. Individuals reporting a greater walking time from their parking spot to their workplace reported more AC (1.21± 3 trips/week) compared with those with closer parking (.27±1.53 trips/week, t=4.197, p<.001). The multivariate model explained 21.5% of the variance in AC (p<.001) with walk time from parking lot (B=.77, p=.001), parking availability (B=-.36, p<.001), perceived coworkers AC (B=1.14, p<.001), and bike parking availability (B=.47, p<.001) as significant predictors. CONCLUSIONS: These findings provide insight into the role of the workplace for influencing AC participations. Employers can consider environmental or policy shifts related to parking availability and cost to target AC among employees. Findings also indicate the importance in creating a positive social environment for promoting AC through interventions promoting social support and shifting social norms around AC.