Many older adults use complementary therapies in health self-management but do not disclose this use to their physicians. This article examines factors affecting disclosure of complementary therapy use and considers ethnic and gender differences in disclosure. It is based on a systematic qualitative analysis of in-depth interviews conducted with 62 African American and White adults aged 65 and older. Twenty-three of the 39 older adults who acknowledge using complementary therapies disclose this to their physicians. Themes leading to disclosure are believing that physicians are supportive and the importance of sharing information. Themes for not disclosing complementary therapy use include physicians’ negative views, complementary therapy use affecting physicians’ incomes, and the need to protect cultural knowledge. African American women were least likely to discloseuse. Disclosure by older adults to their physicians is a complex decision process. Medical encounters, including decisions regarding information to disclose, are embedded in broader social structures.