Okay, of the top of my head, here's some that will probably be enough to keep you busy for a while.
By Fritz Leiber, the Fafhrd and the Grey Mouser books: Swords and Deviltry, Swords Against Deathp, Swords in the Mist, Swords Against Wizardry, Swords of Lankhmar, Swords and Ice Magic, and The Knight and Knave of Swords.
By Poul Anderson, The Broken Sword, High Crusade, Roma Mater, Galicenae, Dahut, The Dog and the Wolf, and Three Hearts and Three Lions.
By Andre Norton, her Witch World books: Witch World, Web of the Witch World, Three Against the Witch World, Warlock of the Witch World, Sorceress of the Witch World, Trey of Swords, Ware Hawk, The Gate of the Cat. (That would be a start, there are a couple dozen other books by Norton set in the Witch World).
By Robert Howard, any of his Conan stories.
By Ursula K. LeGuin, the Earthsea books: A Wizard of Earthsea, The Tombs of Atuan, and The Furthest Shore. The other books in the series (Tehanu, and The Other Wind) were written much later, and have a different tone. Some people like them, others don't.
By Evangeline Walton Prince of Annwn, The Song of Rhiannon, The Children of llyr, and The island of the Mighty.
By Lloyd Alexander, the Chronicles of Prydain: The Book of Three, The Black Cauldron, The Castle of Llyr, Taran Wanderer, and The High King. Also The Foundling and Other Tales of Prydain.
By Patricia McKillip, the Hed series: Riddle Master of Hed, Heir of Sea and Fire, and Harpist in the Wind. Also The Forgotten Beasts of Eld, and The Changeling Sea.
By Richard Cowper The Road to Corlay, A Dream of Kinship, and A Tapestry of Time.
By Joel Rosenberg, the Guardians of the Flame series: The Sleeping Dragon, The Sword and the Chain, The Silver Crown, The Heir Apparent, The Warrior Lives, The Road to Ehvenor, and a couple others.
By Orson Scott Card, the Alvin Journeymaker books: Seventh Son, Red Prophet, Prentice Alvin, Alvin Journeymaker, and so on.
By John Bellairs The Face in the Frost.
Some other time I'll look through my collection and see what else suggests itself to me.