Flexible and stretchable electronics possess great potential because these could substitute traditional electronics in many fields, e.g., wearable sensors, flexible electronic skin, and flexible supercapacitors. Research advances in the field of flexible/stretchable electronics are expedited with developments in nanomaterials and nanomanufacturing techniques. Conductive inorganic nanomaterials with structures based on carbon materials and metal nanowires are integrated with several flexible/stretchable configurations to meet the demands of various electronics, e.g., strain sensor, field-effect transistors, and supercapacitors. This review will systemically introduce the progress in the field of flexible/stretchable electronics, including synthesis and processing of nanomaterials, structural design, and practical applications.