Land Coastal Defence (or Land Coastal Command, Polish: Lądowa Obrona Wybrzeża, abbr. LOW), commanded by Colonel Stanisław Dąbek (land forces), was an important unit tasked with the defence of Poland's Baltic Sea coast during the 1939 invasion.
LOW was at first subordinate to the Toruń-based military area command led by General Władysław Bortnowski (Armia Pomorze), but was later reassigned from Armia Pomorze to the Polish Navy, and received orders directly from Counter-Admiral Józef Unrug. Its first commander was Col. Józef Sass-Hoszowski and, after July 23, 1939, Col. Stanisław Dąbek. It was part of the Coastal Defence Group (Grupa Obrony Wybrzeża), tasked with organizing the defence of the Polish seashore, as well as the borders with Nazi Germany and Danzig, and the preparation of the defence of the Polish naval bases and mobilization centres (Gdynia, Oksywie, Hel, Westerplatte). LOW was to defend Gdynia and Oksywie; Hel and Westerplatte had their own dedicated formations under the Coastal Defence Group. LOW's task was to defend the most important of Polish mobilization centers around Gdynia - the major Polish port - for about 8–10 days, after which it was expected to be relieved by a Polish Army counterattack. As it was clear that the Polish defenders of the so-called Polish Corridor would be at least temporarily cut off from the Polish mainland, the defence was organized into several fortified lines that were to shield the naval base of the Hel Peninsula and the city of Gdynia from all sides.