This thesis presents the negative impact of cosmetic products on marine ecosystems. The problems of plastic contamination, negative effects of sunscreens with a sun protection factor (SPF), and substances that do not degrade or degrade slowly the marine environment or not at all, but have a carcinogenic, mutagenic and toxic impact on the marine organism, are listed. In recent years, the problem of plastic pollution has been growing due to the increased production of plastic products, but also due to the expansion of the cosmetics industry, which uses large quantities of plastic products. Due to the significant release of plastic into the environment, micro- and nano-plastic particles are dispersed, retained and accumulated, and they can be found in all oceans, both in the water column and in the sediment. In addition to the negative impact on marine organisms, these particles may also contain other pollutants. Creams with a protective factor negatively affect coral reefs and can cause increased sensitivity to bleaching, DNA damage (genotoxicity), skeletal growth disorders and significant deformations of young corals. Furthermore, cosmetic formulas and parts of products that are not fully degradable a resource of pollution and have a negative impact on the environment. Therefore, global brands tend to reduce waste production by changing product packaging and as well as trade and sales methods.