In J. R. R. Tolkien's legendarium, Himring was a high hill in northeast Beleriand. After the Drowning of Beleriand during the War of Wrath, the peak of Himring remained above the waves as the Isle of Himring.
The great fortress on Himring was built when the Sons of Fëanor went east after Thingol became aware of the Kinslaying at Alqualondë. It was the chief stronghold of Maedhros, from which he guarded the northeastern border region that became known as the March of Maedhros.
The Hill of Himring is described as "wide-shouldered, bare of trees, and flat upon its summit, surrounded by many lesser hills". To the east of them was Maglor's Gap and Ered Luin; to the west the Pass of Aglon, which Curufin and Celegorm guarded. In the wooded hills around Himring were the springs of the rivers Celon and Little Gelion.
The fortress upon Himring was the only in the East Beleriand to stand firm through the Dagor Bragollach, and many survivors from the surrounding regions, including Maedhros' brother Maglor, rallied there. But in the Battle of Unnumbered Tears the Sons of Fëanor were utterly defeated; the March of Maedhros was no more, and the Hill of Himring was garrisoned by the soldiers of Angband.