Climate change presents a substantial peril to marine biodiversity, specifically affecting coral reef ecosystems, which are among the most varied and fruitful marine environments. This study paper examines the diverse impacts of climate change on coral reefs, with a specific emphasis on case studies conducted in the Great Barrier Reef in Australia, the Coral Triangle in Southeast Asia, and Caribbean coral reefs. The study examines the impacts of elevated sea temperatures, ocean acidification, increasing sea levels, and heightened occurrence of extreme weather events on these vital ecosystems. This work seeks to offer a thorough comprehension of the present and anticipated effects of climate change on the biodiversity of coral reefs, emphasising both the ecological and socio-economic consequences through meticulous analysis.