In this chapter, we have discussed optimized image encryption techniques, which have been inspired by bio-optimization. An optimized-based image encryption algorithm is an essential tool in this modern world to keep the image secure, meet real-time demand (fast communication or processing) and prevent unauthorized access. This review chapter is categorized into four sections. Firstly, we briefly discuss the encryption and decryption model, and then the classification of the bio-optimization methods along with their flowcharts. Secondly, we have reviewed optimized image encryption algorithms in sequential order. Optimization techniques that use a mixture of different algorithms have been given a separate section as miscellaneous. Thirdly, we have provided a table for discussion in which we have listed the advantages and disadvantages of these algorithms. Finally, we have provided a conclusion and future work to be done in the last section.