The recovery of cadmium from electronic waste (e-waste) by electrowinning has attracted much attention as a sustainable approach for metal recovery. However, the process faces several challenges, including low recovery efficiency and high energy consumption. Optimization techniques can be used to address these challenges and improve the recovery of cadmium from e-waste by electrowinning. This paper provides an overview of the current state of research on optimization techniques for the recovery of cadmium from e-waste by electrowinning. Various techniques, such as response surface methodology, artificial neural networks, and genetic algorithms, have been used to optimize the process parameters and improve the recovery efficiency. The use of advanced electrode materials and the optimization of electrode design also contribute to the improvement of the electrowinning process. This paper highlights the importance of optimization techniques, existing optimization techniques investigating by various authors for the recovery of cadmium from e-waste by electrowinning and provides insights into future research directions for further enhancing the efficiency and sustainability of the process.