This edited volume presents cutting-edge insights into the multifaceted roles of melatonin in improving plant resilience to both biotic and abiotic stresses. It brings together recent advances in understanding how melatonin regulates signal transduction pathways to modulate plant growth and development under challenging environmental conditions. The chapters explore melatonin's involvement in reactive oxygen and nitrogen species signaling, its interaction with heat shock proteins, regulation of ionic homeostasis, and its cross-talk with key phytohormones. The book also examines its efficacy in mitigating drought, salinity, heat, and heavy metal stress. A valuable resource for researchers, agronomists, and policymakers, this book combines scientific depth with practical relevance. It bridges the gap between theoretical research and practical applications, making it an essential resource for those seeking to enhance crop performance and resilience in the face of climate change and environmental pressures.