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Orc-holds is a term used to refer to underground tunnellings of the Orcs of the Misty Mountains, found throughout the Misty Mountains and Mount Gundabad. From there they caused trouble in the nearby regions, such as Eriador, Lothlórien and the Shire.

Mount Gundabad was the capital of Orcs in the North after its first sack in the Second Age. Major Orkish operations such as battles during the War of the Dwarves and Orcs and the Battle of Five Armies[1] were from it.

Orkish holds included Moria and the underground Goblin-town led by the Great Goblin.[2]