A flexible supercapacitor, a method of manufacturing the same, and a device including the same are provided, the flexible supercapacitor includes a first flexible electrode assembly, a second flexible electrode assembly corresponding to the first flexible electrode assembly, a separator for preventing contact between the first flexible electrode assembly and the second flexible electrode assembly, and an electrolyte between the first flexible electrode assembly and the second flexible electrode assembly. The flexible supercapacitor may include a tube including the first flexible electrode assembly, the second flexible electrode assembly, the separator, and the electrolyte.