This Thesis aims to showcase the ISO 14000 series of standards in a comprehensive way, and centering to the matter of dangerous (hazardous) goods carried by merchant ships. Firstly we will refer to the main types of hazardous cargoes and their means of transportation by sea, and give examples of notorious marine accidents involving these kinds of cargoes. Then we will describe the framework of ISO 14000 on environmental protection and its relevance to shipping and dangerous cargoes. Finally, we will refer to the obligations of shipping companies, authorities and other organizations in regards to management of hazardous cargoes and environmental protection. The main content of the thesis will also be accompanied with elaborate figures of hazardous goods’ signs (divided in categories) and tables of standard and codes. Thus we will be able to provide a comprehensive overlook on the ISO standards related to hazardous materials and their proper management.