The textbook "Stochastic Hydrology and its Use in Water Resources Systems Simulation and Optimization" provides a comprehensive analysis of stochastic hydrology and its application in the planning and management of water resource systems. It highlights the inherent randomness of the hydrological cycle and the necessity to integrate these uncertainties into decision-making processes. The authors, renowned experts in the field, present current techniques and methods used in practice to address the challenges of water resource planning. The book is aimed at both practitioners and researchers who wish to apply advanced approaches to account for hydrological uncertainties in the simulation and optimization of water resource systems. It offers a synthesis of current knowledge and demonstrates how theoretical concepts can be implemented in real-world applications.