Objective: Digital health interventions (DI) open the possibility for cancer patients and survivors to manage the disease and its side effects when they return home after treatment. This study aims to highlight the components of DI, investigate patient engagement with DI, and explore the effects of DI on psychosocial variables. Methods: In September 2017, we performed a systematic review of studies focusing on DI which target cancer patients or survivors. Results: A total of 29 articles (24 studies) were reviewed. There was considerable heterogeneity in study methods, in outcome definitions, in measures for engagement with DI and in psychosocial variables assessed. Results from the studies showed a high level of engagement. Self‐efficacy, psychological symptoms, and quality of life were the most commonly assessed psychosocial variables. However, results for the effect of DI on psychosocial variables were inconsistent. Regarding pain management, results were in line with what one would expect. Conclusions: The present review showed that despite the heterogeneity in the studies assessed and inconsistent results, DI may constitute an excellent means to help cancer patients and survivors cope better with the disease and with treatment side effects, as they can improve self‐management and wellbeing. In order to acquire a greater understanding of the mechanisms underlying cancer patients'/survivors' psychological and behavioral changes in terms of adopting DI, direct comparison between studies is needed. However, this can only come about if methodological and conceptual standardization of DI is implemented.