Island territories play a great role in international relations as they possess several major characteristics, which attract the attention of the states. One of such factors is the role of island territories (islands, isles, rocks, etc) in the delimitation of maritime spaces.The article offers an analysis of all major types of island territories. The definition of each island territory and the history of its elaboration are included in the analysis. Also the practice of the states in the sphere of delimitation where islands are involved is being described on par with the judgments of courts (particularly International Court of Justice) in respect of these issues.The type of the island territory presupposes the size of maritime spaces attributed to every particular territory and consequently the amount of resources the state will be entitled to. The resources are often the reason for the emerging conflicts in respect of the island territories. If the norms of international law are settled in this respect and each type of insular territory is attributed a set size of maritime spaces and related rights, this will eliminate a great number of problems with regard to delimitation where islands are involved.Thus there is a necessity of elaboration of a single official document on this issue, as it may resolve many existing or potential conflicts in respect of islands. This document can be adopted in the framework of the UN General Assembly or IMO. There is also a possibility of introducing amendments to the existing convention but now it seems impossible and unnecessary though the regime of islands should be clarified in order to preserve stability and good neighborly relations between states.