The marine environment, a complex ecosystem supporting diverse life forms, is under siege from a myriad of anthropogenic pollutants. Chemicals pose a significant threat to marine organisms and, consequently, human health. This chapter delves into the multifaceted impacts of chemical toxicity on marine ecosystems, examining sources, types, and mechanisms of pollution. A wide array of chemicals, including heavy metals, pesticides, pharmaceuticals, and industrial byproducts, find their way into marine environments through various pathways, such as industrial discharges, agricultural runoff, and atmospheric deposition. Once introduced, these pollutants undergo complex transformations, affecting their toxicity and persistence. Bioaccumulation and biomagnification further exacerbate the problem, as contaminants concentrate in higher trophic levels, posing risks to top predators, including humans. The consequences of chemical pollution on marine life are far-reaching. From physiological disruptions at the cellular level to population declines and ecosystem imbalances, the impacts are profound. Coral reefs, crucial for marine biodiversity, are particularly vulnerable to chemical stressors. Additionally, the economic implications are substantial, affecting fisheries, tourism, and coastal communities. To mitigate these challenges, a comprehensive approach is required. This includes stringent regulations, advanced monitoring technologies, and effective remediation strategies. Investing in research and development to identify emerging pollutants and develop innovative treatment methods is essential. Moreover, fostering international cooperation and public awareness is crucial for addressing this global issue. By understanding the complex interplay between chemical pollutants, marine ecosystems, and human health, we can develop effective strategies to protect our oceans and ensure the well-being of future generations.