This chapter contains sections titled: What is the Use of Light-Controllable Polymer Micelles? How to Design Azobenzene Block Copolymers for Light-Controllable Micelles? Synthesis of Azobenzene-Containing Amphiphilic Block Copolymers Reversible Dissociation and Formation of Azobenzene Block Copolymer Micelles Factors Influencing the Reversible Dissociation and Formation Processes Other Light-Responsive Azobenzene-Based Polymer Micelles Perspectives and Future Work Acknowledgments References