
The 1st U-boat flotilla also known as the Weddigen flotilla, was the first operational U-boat unit in Nazi Germany's Kriegsmarine (navy). Founded on 27 September 1935 under the command of Fregattenkapitän Karl Dönitz, it was named in honor of Kapitänleutnant Otto Weddigen. Weddigen, a U-boat commander during World War I, died on 18 March 1915 after his submarine U-29 was rammed by the British battleship HMS Dreadnought in the North Sea.

The 2nd Marine Division (2. Marine Division) was a military formation of the German Navy (Kriegsmarine) under control of the German Army (Heer) during the later part of the Second World War.

The 2nd U-boat Flotilla, also known as the Saltzwedel Flotilla, was the second operational U-boat unit in Nazi Germany's Kriegsmarine. Founded on 1 September 1936 under the command of Fregattenkapitän Werner Scheer, it was named in honour of Oberleutnant zur See Reinhold Saltzwedel. Saltzwedel, a U-boat commander during World War I, died on 2 December 1917, when his submarine UB-81 was sunk by a mine in the English Channel.

The 3rd U-boat Flotilla, also known as Lohs Flotilla, was the third operational U-boat unit in Nazi Germany's Kriegsmarine. Founded on 4 October 1937 under the command of Kapitänleutnant Hans Eckermann, it was named in honour of Oberleutnant zur See Johannes Lohs. Lohs, a U-boat commander during World War I, died on 14 August 1918 after his submarine UB-57 was sunk by a mine.

The 5th U-boat Flotilla, also known as Emsmann Flotilla, was a U-boat flotilla of Nazi Germany's Kriegsmarine during World War II.

The 6th U-boat Flotilla, also known as Hundius Flotilla, was a front-line unit of Nazi Germany's Kriegsmarine before and during World War II.

The 8th U-boat Flotilla was formed in June 1941 in Königsberg under the command of Kapitänleutnant Georg-Wilhelm Schulz, who also at this time commanded the 6th U-boat Flotilla in Danzig. It was primarily a training flotilla but in the last months of the war some flotilla boats were in combat against the Soviet Navy in the Baltic Sea. The flotilla was disbanded in January 1945.

The 9th U-boat Flotilla was formed in October 1941 in Brest. It became operational in April 1942, after the first combat ready U-boat, U-213, reached the Brest base on 20 March 1942. The flotilla operated mostly various marks of the Type VII U-boat and it concentrated its efforts mainly in the North Atlantic, against convoys to and from Great Britain. The flotilla served from Brest until the base was threatened with being captured by American forces. The last of the flotilla's U-boats, the U-256 left Brest on 4 September 1944 for Bergen, Norway, and this marked the end of the 9th Flotilla. All its surviving boats were reassigned to the 11th U-boat Flotilla in Bergen.

The 10th U-boat Flotilla was a German U-boat flotilla used for front-line combat purposes during World War II. Founded on 15 January 1942 at Lorient under the command of Korvettenkapitän Günther Kuhnke, eighty U-boats operated with this flotilla before it was dissolved on 21 August 1944, and the remaining U-boats were moved to bases in Norway and Germany. Kuhnke himself took command of U-853, the last U-boat to leave, on 27 August 1944 to sail to Flensburg where he assumed command of 33rd U-boat Flotilla.

The 11th Marine Division (11. Marine Division) was an infantry formation of the German Kriegsmarine under the control of the German Heer during the Second World War.

The 11th U-boat Flotilla was formed on 15 May 1942 in Bergen, Norway. The flotilla operated mainly in the North Sea and against the Russian convoys in the Arctic Sea. The flotilla operated various marks of the Type VII U-boat until September 1944, when it had an influx of some Type IX boats from France. It also was the only flotilla to field the Type XXI U-boat for operational use, but the war ended before U-2511 saw action. The Flotilla was disbanded on 9 May 1945 with the German surrender.

The 13th U-boat Flotilla was a World War II U-boat unit of Nazi Germany's Kriegsmarine stationed in Trondheim, Norway. The emblem of the unit was a cross with a Viking ship in the middle.

The 14th U-boat Flotilla was a short-lived unit of Nazi Germany's Kriegsmarine during World War II.

The 19th U-boat Flotilla was a unit of Nazi Germany's Kriegsmarine during World War II.

The Croatian Naval Legion was a contingent of volunteers from the Independent State of Croatia that served with Nazi Germany's navy Kriegsmarine, on the Black Sea and Adriatic Sea during World War II.

The K-Verband was a World War II German naval unit that operated a mixture of midget submarines and explosive speed boats. It was formed in April 1944 and operated until 26 April 1945.

Minesweeper flotillas of the Kriegsmarine were administrative units which grouped German minesweepers together. There were three types of minesweeper flotillas: standard minesweepers, auxiliary minesweepers, and "mine barrage" vessels. Flotilla commanders operated from a shore office, and were usually commanded by an officer ranked as a Korvettenkapitän. All minesweeper flotillas were under the command of the Führer der Minensuchboote which, by 1940, had been divided into three separate offices for activities in the North Sea, Baltic Sea, and off the coast of France.

The Gruppe Monsun or Monsoon Group was a force of German U-boats (submarines) that operated in the Pacific and Indian Oceans during World War II. Although similar naming conventions were used for temporary groupings of submarines in the Atlantic, the longer duration of Indian Ocean patrols caused the name to be permanently associated with the relatively small number of U-boats operating out of Penang. After 1944, the U-boats of the Monsun Gruppe were operationally placed under the authority of the Southeast Asia U-boat Region.

Surface flotillas of the Kriegsmarine were organizational groupings of German naval vessels during World War II based on class of vessel and geographical location. Surface flotillas were not operationally deployed units, but functioned through the administrative command chain of the Kriegsmarine.

Task Force Thiele was an organizational unit of the German Kriegsmarine during World War II. It was named after its commander Vizeadmiral August Thiele who led the task force from 23 March 1945 until it was disbanded on 27 April 1945. It was formed from the Second Task Force which had been created on 28 July 1944 from the Baltic Sea Training Unit, also under command of Thiele.