Zinc oxide nanowires (ZnO NWs) have emerged as a promising electron-transporting layer (ETL) in flexible perovskite solar cells (FPSCs) due to their excellent properties, such as high electron mobility and easy processability at low temperatures. This review discusses the control of ZnO NW growth parameters, including the growing method, seed layer utilization, and precursor concentration, to achieve uniform and well-aligned NWs on flexible substrates. The role of ZnO NWs in FPSCs is highlighted, emphasizing their impact on device performance and stability. Key findings include the importance of optimizing NW length, diameter, density, and aspect ratio through controlled growth conditions. The review also explores the use of seed layers to improve NW alignment and reduce recombination issues. Additionally, the influence of growing time and precursor concentrations on NW properties is discussed. The review concludes with a summary of the advancements in ZnO NW-based FPSCs, noting that while efficiency has improved from 2.6% to ~15%, challenges remain in achieving comparable performance to rigid substrate-based devices. Future research directions include optimizing NW properties, improving interface quality, and enhancing perovskite absorber layer performance.Zinc oxide nanowires (ZnO NWs) have emerged as a promising electron-transporting layer (ETL) in flexible perovskite solar cells (FPSCs) due to their excellent properties, such as high electron mobility and easy processability at low temperatures. This review discusses the control of ZnO NW growth parameters, including the growing method, seed layer utilization, and precursor concentration, to achieve uniform and well-aligned NWs on flexible substrates. The role of ZnO NWs in FPSCs is highlighted, emphasizing their impact on device performance and stability. Key findings include the importance of optimizing NW length, diameter, density, and aspect ratio through controlled growth conditions. The review also explores the use of seed layers to improve NW alignment and reduce recombination issues. Additionally, the influence of growing time and precursor concentrations on NW properties is discussed. The review concludes with a summary of the advancements in ZnO NW-based FPSCs, noting that while efficiency has improved from 2.6% to ~15%, challenges remain in achieving comparable performance to rigid substrate-based devices. Future research directions include optimizing NW properties, improving interface quality, and enhancing perovskite absorber layer performance.