Despite recent advances in cancer control, numerous disparities exist in the areas of patient access to care, self-management, and quality of life. However, mobile health technology shows promise as a tool to reduce disparities among patients with cancer and cancer survivors by overcoming such barriers as limited access to providers, difficulty communicating with providers, and inadequate communication between patients and providers regarding symptoms. This narrative review draws on the literature in cancer and noncancer populations to identify factors that create or maintain disparities and to describe opportunities for mobile health technology to reduce disparities.