The Maritime and Colonial League (Polish: Liga Morska i Kolonialna) was a mass Polish social organization, created in 1930 out of the Maritime and River League (Liga Morska i Rzeczna). In the late 1930s it was directed by general Mariusz Zaruski and its purpose was to educate the Polish nation about maritime issues. It also actively supported the development of both a merchant fleet and large navy, as well as the creation of Polish colonies and overseas possessions.