Hazardous and noxious substances are defined as any substance, except oil, which in contact with the marine environment poses a danger to human life and the marine environment. When transporting these substances, the provisions of the SOLAS and MARPOL conventions, the IMDG and SEBC codes must be observed, and other legal regulations must be complied with. This paper collected data from the CIIMAR database on accidents involving hazardous and noxious substances in the marine environment. 119 incidents were analyzed regarding to countries, HNS categories, number of accidents, number of cargoes, SEBC classification, categories of Annex II, IMDG Code by decades. The results showed that most accidents occurred in the USA, and in terms of decades, the most accidents occurred during the 1990s. The largest number of different cargos was in 1985, and ammonium nitrate was spilled most often in accidents. In the period of the 1980s, there was a greater number of cargoes that were in a packaged state, and in the 1990s, there was a greater number of cargoes that were in a bulk state.