Marine pollution and climate change are two of the most pressing environmental issues today, and they are closely interconnected. Marine ecosystems are vital for biodiversity, food security, and climate regulation. However, these ecosystems face severe threats due to pollution, particularly from plastics and other anthropogenic wastes, coupled with climate change impacts such as ocean acidification, rising sea levels, and habitat degradation. Ocean renewable energy technologies, such as offshore wind and tidal power, offer promising solutions for sustainable energy generation, but they depend on healthy marine environments for long-term success. The adoption of circular economy (CE) approach which focuses on sustainable resource use, waste minimization, and regenerative systems, provides a robust framework to mitigate marine pollution and address climate challenges. This article explores key circular economy strategies for addressing marine pollution and examines the broader implications for climate action and the development of ocean renewable energy.