The term responsive describes aspects of a visualization that automatically adapt to changes in, for example, device characteristics, environment, usage context, or data. The chapter discusses aspects of responsive mobile data visualization, and summarizes the types of change that a visualization must respond to and how they can be sensed on mobile devices. Ten responsive visualization design strategies are reviewed, including adaptations of scale, layout, and visual encoding, as well as attentional cues and specific interactions. The chapter concludes with future research directions pertaining to responsive visualization design for mobile devices and beyond.