The aim of the article is to present, in a short and a synthetic form, self-governments as new actors on the international arena. Discussed are the genesis and the development of this new international activities being undertaken by local residential areas such as the “twinning movement” and the programme for establishing “sister cities”. Briefly described are the key international organizations focused on the local self-governance. Discussed is also, in a relative detail, is the cooperation of the Polish self-governance entities with local self-governance partners within the international sphere. The author concludes by attempting to define the scope and importance of the international cooperation of local self-governance entities in general and its impact on the individual participating partners.