In J. R. R. Tolkien's fictional universe of Middle-earth, the Battle of Nanduhirion was the last battle in the War of the Dwarves and Orcs.

The Battle of Nanduhirion, also called the Battle of Azanulbizar after the Khuzdul name, was fought in the year 2799 of the Third Age at the eastern gate of Moria between the Dwarves of all seven houses, and the Orcs of the Misty Mountains.

It was the greatest battle of the War of Dwarves and Orcs, and was a decisive victory for the Dwarves. However, the battle had claimed the lives of many; including Frerin the second son of Thráin II, and the younger brother of Thorin Oakenshield. His kinsman Fundin also fell. Náin son of Grór was slain in a fight with Azog the Goblin right outside the East Gate. Azog was then slain by Náin's son Dáin Ironfoot.

After the War Thráin II, heir of Durin, wished to enter and reclaim Moria, but the Dwarves of Durin's folk were too few, and the Dwarves of other six houses refused to get involved with Durin's Bane.