Due to the increasing water temperature, climate change, marine pollution, tourism and research, polar regions such as the Antarctic, which constitutes a common natural heritage, should be addressed with special attention. Only recently, as a consequence of climate change, a big iceberg has detached from the ice shelf in the Antarctic and is currently floating in the Antarctic ocean.The following paper shows how the Antarctic marine environment is being protected by four Treaties. The Antarctic Treaty, which is a milestone in the Antarctic Treaty system and came into existence in the course of the International Geophysical Year, is being discussed. Principals, aims, institutions, parties of the Treaty and enforced territorial claims are presented. The Convention for the Conservation of Antarctic Seals, consisting of a main text and an appendix, grants protection to the six seal species and prohibits their catching and killing. Aims, maximum catches and close seasons are covered in this context. Due to the Convention on the Conservation of Antarctic Marine Living Resources, the Antarctic ecosystem as well as the marine living resources and thus, the whole Antarctic environment are being protected. The Protocol on Environmental Protection declares the Antarctic as nature park, grants a comprehensive environmental protection and records all human actions that constitute an interference with the Antarctic environment.Alongside these four contracts, further (extra-antarctic) Treaties, which are mentioned in the course of this paper, provide protection for the Antarctic marine environment. Concluding, the efforts and aims of various NGOs are presented.