Posttraumatic growth (PTG) after cancer can minimize the emotional impact of disease and treatment; however, the facilitators of PTG, including support-seeking, are unclear. We examined the role of support-seeking on PTG among 604 breast cancer survivors ages 40–64 from the Health Eating, Activity, and Lifestyle (HEAL) Study. Multivariable linear regression was used to examine predictors of support-seeking (participation in support groups and confiding in healthcare providers) as well as the the relationship between support-seeking and PTG. Support program participation was moderate (61.1%) compared to the high rates of confiding in health professionals (88.6%), and African Americans (AA) were less likely to report participating than Non-Hispanic Whites (NHWs) (Odds Ratio: 0.14 (0.08, 0.23)). The mean (SD) PTG score was 48.8 (27.4) (range 0–105). Support program participation (β=10.4) and confiding in healthcare providers (β=12.9) were associated (p<0.001) with higher PTG. In analyses stratified by race/ethnicity, PTG was significantly higher in both NHW and AA support program participants (p<0.01), but not significantly higher in Hispanics/Latinas. Confiding in a healthcare provider was only associated with PTG for NHWs (p= 0.02). Support program experiences and patient-provider encounters should be examined to determine which attributes facilitate PTG in diverse populations.