The 20th Mountain Army, initially known as the Lapland Army, was a field army-level military formation of the German Army during World War II.

The 20th Mountain Army was one of the two army echelon headquarters controlling German troops in the far north of Norway and Finland during World War II. It was formed in June 1942 by renaming the Lapland Army command, which had been formed in January. On 18 December 1944, the 20th Mountain Army took over the role of Wehrmachtsbefehlshaber Norwegen from the dissolved Army Norway.

No.	Portrait	Commander	Took office	Left office	Time in office
1		Dietl, EduardGeneraloberst Eduard Dietl (1890–1944)	14 January 1942	23 June 1944 †	2 years, 161 days
2		Rendulic, LotharGeneraloberst Lothar Rendulic (1887–1971)	25 June 1944	21 January 1945	210 days
3		Böhme, FranzGeneral der Gebirgstruppe Franz Böhme (1885–1947)	21 January 1945	8 May 1945	107 days

• Generalleutnant Ferdinand Jodl (22 June 1942 – 1 March 1944)
• Generalleutnant Hermann Hölter (1 March 1944 – 8 May 1945)

April 1942:

• 2nd Mountain Division
• 6th Mountain Division
• 7th Mountain Division
• 163rd Infantry Division
• 169th Infantry Division
• 210th Infantry Division
• SS Division Nord
• Finnish 3rd Division

• 211th Panzer Battalion
• 741st StuG Battalion
• 742nd StuG Battalion

• Army Norway (Wehrmacht)

• "Armee Lappland / 20. Gebirgs-Armee". German language article at www.lexikon-der-wehrmacht.de. Retrieved 12 April 2005.