Dyadic coping, how couples cope together to deal with a stressor like chronic illness, has received increased attention over the last three decades. The aim of the current study was to summarize the current state of research on DC in couples. We conducted a scoping review of qualitative, quantitative, and mixed-methods studies published between 1990 and 2020, assessing DC in couples during three decades. 5,705 studies were identified in three electronic databases and hand searches. We included 643 sources in this (...) review. Most studies were based in the global North, particularly in the US and Europe. Publication numbers increased constantly over time. A third of study designs were cross-sectional studies followed by qualitative and longitudinal studies. The most prolific DC research areas were related to DC and minor stressors and DC and major physical health stressors. Overall, DC has been established internationally as a highly relevant construct in many disciplines. To conclude, the review reveals that future studies should focus on predictors, trajectories, and the importance of very specific DC behaviors for personal and dyadic functioning. (shrink)