In J. R. R. Tolkien's fictional universe of Middle-earth, Durin's folk is the most important folk of Dwarves.

Durin's folk were by right the inhabitants of Khazad-dûm, also called the Longbeards. Their first King was Durin the Deathless.

The Dwarves of Durin's folk were ruled by six kings named Durin, all fathers and sons, until Durin VI, who was killed by Durin's Bane in 1980 of the Third Age. After him Durin did not return to his people for many years, until in the Fourth Age a Durin VII appeared, son of Thorin III, grandson of Dáin II Ironfoot, and descendant in direct line from Durin the Deathless. Durin VII was known as Durin the Last.

Line of Durin's folk

• Durin I (The Deathless), father of Dwarves. Founder and first King of Khazad-Dûm.
• Durin II–V, Durin Reincarnated.
• Durin VI son of Durin V. He was killed by Durin's Bane in 1980 T.A.
• Náin I son of Durin VI. Last King of Khazad-Dûm, he was killed by Durin's Bane in 1981 T.A.
• Thráin I son of Náin I. Founded Erebor in 1999 T.A.
• Thorin I son of Thráin I. He left Erebor for the Ered Mithrin
• Glóin son of Thorin I
• Óin son of Glóin
• Náin II son of Óin
• Dáin I son of Náin II. Last King of all of Durin's folk, he was killed by a cold-drake in 2589 T.A.
• Thrór son of Dáin I. Returned to Erebor as King in Exile, and tried to reclaim Moria. Was killed by Azog the Orc in 2790 T.A. (Start of the War of Dwarves and Orcs)
• Thráin II son of Thrór. Lived in or near Belegost in the Ered Luin. He died in the dungeons of Dol Guldur in 2850 T.A., and was the last holder of the Last Ring of the Dwarves.
• Thorin Oakenshield son of Thrain II. He refounded Erebor, but was killed in the Battle of Five Armies in 2941 T.A.

After Thorin's death the line passed to his great-nephew Dáin II Ironfoot (son of Grór, younger brother of Thráin II), who was killed in the War of the Ring in 3019 T.A. Dáin's son Thorin III Stonehelm had a son, Durin VII the Last, who refounded Khazad-dûm.