Climate change is reshaping agricultural ecosystems and has become a major force of the emergence, evolution and spread of fungal pathogens affecting crops worldwide. Rising temperatures and atmospheric carbon dioxide, altered rainfall patterns and more frequent extreme weather events are changing host–pathogen–environment interactions. These shifts can enhance pathogen survival, dispersal and establishment in new regions, while accelerating adaptation through increased thermotolerance, virulence and fungicide resistance. As a result, fungal diseases are becoming more frequent, severe and difficult to manage, threatening food security and agricultural sustainability. This review synthesises current knowledge on how climate change promotes new fungal threats and alters the epidemiology of established diseases in major cropping systems. It highlights the roles of temperature, rainfall, humidity and elevated CO 2 in influencing fungal pathogenicity, host susceptibility and disease outcomes. Case studies of important diseases, including Fusarium head blight, potato late blight and wheat stripe rust, show how changing environmental conditions are intensifying disease pressure, reducing yields and increasing mycotoxin risks. The review also examines mechanisms of pathogen adaptation, including genetic plasticity, rapid mutation and selection for fungicide resistance, which further complicate management. In addition, it discusses the limitations of conventional control measures under changing climates and emphasises the need for integrated responses. These include breeding climate‐resilient and disease‐resistant cultivars, improving forecasting and early detection systems and promoting sustainable crop protection practices. Strengthening these approaches will be essential to reduce the impacts of climate‐driven fungal diseases and support resilient food production systems in a warming world.