This is a short list so far; please let me know of any others (with sources, please).
- ACHSE
- German plan to take over control of Italy.
- ALARICH
- German plan for the occupation of northern Italy by Army Group B (Rommel) if Italy collapsed politically
- ANTON
- (10-11 November 1942) German occupation of southern France (areas previously unoccupied and under the jurisdiction of the Vichy government)
- AUSLADUNG
- German secondary attack designed to extend the Tunis bridgehead in the north as part of Operation OCHSENKOPF
- BARBAROSSA
- (1941) German offensive against the USSR
- EILBOTE
- (January 1943) a German operation to capture the Kebir River dam and to drive the French off the Eastern Dorsal in Tunisia
- FRÜHLINGSWIND
- (February 1943) German Fifth Panzer Army attack against Sidi Bou Zid
- GELB
- German plan for the invasion of France, the Netherlands, and Belgium.
- HERBSTNEBEL
- German operational plan for a withdrawal in Italy beyond the Po River
- HERKULES
- (1942) German plan (cancelled) to invade Malta (also HERCULES)
- KONSTANTIN
- German reinforcement of the Balkans and Greece
- KOPENHAGEN
- German plan for the seizure of the Mount Cenis Pass as part of Operation Plan ACHSE
- LEHRGANG
- (11-17 August 1943) evacuation of German troops from Sicily to the Italian mainland
- MORGENLUFT
- (February 1943) German attack by the Afrika Korps against Gafsa after Operation FRUEHLINGSWIND
- NORD WIND
- German counterattack in Alsace, January 1945 against the U.S. Seventh Army (launched 31 December 1944)
- OCHSENKOPF
- (26 February 1943) German operation to extend the Tunis bridgehead by capturing Bédja and Medjez el Bab
- OLIVENERNTE
- (January 1943) German plan (cancelled) to capture Medjez el Bab
- SEELÖWE
- (1940-1941) German plan (canceled) for the invasion of the United Kingdom SEA LION
- SIEGFRIED
- German plan for the occupation of the southern coast of France as part of Operation ACHSE
- STURMFLUT
- (19-22 February 1943) German operation by Field Marshal Rommel against the Kasserine Pass and Sbiba gap
- THESEUS
- (1942) German plan for operations in Libya
- WESERÜBUNG
- German operation against Norway and Denmark.
- WESERÜBUNG NORD
- Plan for occupation of Norway by means of air and seaborne landings at the most important places along the coast.
- WESERÜBUNG SUED
- Plan for occupation of all of Denmark.
- WINTERGEWITTER
- (26 December 1944) German limited objective counterattack against the U.S. IV Corps
Source:
Taken from various publications in the series Report of the Office of the Chief of Military History on the UNITED STATES ARMY IN WORLD WAR II