Mobility is a human right. The traditional definition of mobility in physical therapy practice is centered on translocation and, while accurate, is not comprehensive. In this article, we propose the ON Time Mobility framework: that all children have the right to be mobile throughout their development to explore, engage in relationships, and develop agency to cocreate their lives. This perspective highlights interconnected principles of timing, urgency, multimodal, frequency, and sociability to begin discussions on supporting the right to hours of active mobility each day for all children. We propose critical evaluation and discussion of these principles followed by a call to action to shift our conceptualization and enactment of mobility. This mobility rights perspective challenges current medical systems, industry, and government to collaborate with children with disabilities, their families and communities to support mobility as a source of physical and social interactions that define and develop individuals (see Supplemental Digital Content 1, the Video Abstract, available at: http://links.lww.com/PPT/A398).