Global food security is seriously threatened by climate change, as its effects on agriculture make crop systems more susceptible to biotic and abiotic stresses. The development of crop varieties that are more resilient to these challenges is essential to maintaining food security and agricultural output. The study of gene functions and interactions, known as functional genomics, is essential to this effort because it offers the instruments and information required to precisely modify crop genomes in order to increase their resistance to stress. This review paper examines the use of functional genomic technologies, including genome sequencing, transcriptomics, proteomics, metabolomics, and sophisticated gene editing methods like CRISPRCas9, in the development of crop varieties that are resilient to climate change. It discusses over the difficulties brought about by climate change, such as heat, salinity, drought, and pest issues, as well as how important genes and pathways for stress tolerance have been found using functional genomics. Case studies on staple crops including rice, wheat, maize, and legumes allow us to demonstrate effective instances of how genetic engineering has resulted in increased stress tolerance. In addition, integrative methods that integrate phenomics, computational biology, and bioinformatics to provide a comprehensive picture of how plants react to stress. Additionally addressing the financial, legal, and moral issues surrounding the use of genetically modified crops, highlighting the significance of a well-rounded strategy that guarantees advantages and accessibility for all parties involved, especially smallholder farmers in developing nations. In conclusion, this research highlights the necessity of sustainable and inclusive agricultural practices while offering insights into future directions and the potential of functional genomics to revolutionize crop innovation for climate resilience.