- House Atreides
- Paul Atreides, the Duke's son, and main character of the novel
- Duke Leto Atreides, head of House Atreides
- Lady Jessica, Bene Gesserit and concubine of the Duke, mother of Paul and Alia
- Alia Atreides, Paul's younger sister
- Thufir Hawat, Mentat and Master of Assassins to House Atreides
- Gurney Halleck, staunchly loyal troubadour warrior of the Atreides
- Duncan Idaho, Swordmaster for House Atreides, graduate of the Ginaz School
- Wellington Yueh, Suk doctor for the Atreides who is secretly working for House Harkonnen
- House Harkonnen
- Baron Vladimir Harkonnen, head of House Harkonnen
- Piter De Vries, twisted Mentat
- Feyd-Rautha, nephew and heir-presumptive of the Baron
- Glossu "Beast" Rabban, also called Rabban Harkonnen, older nephew of the Baron
- Iakin Nefud, Captain of the Guard
- House Corrino
- Shaddam IV, Padishah Emperor of the Known Universe (the Imperium)
- Princess Irulan, Shaddam's eldest daughter and heir, also a historian
- Count Fenring, the Emperor's closest friend, advisor, and "errand boy"
- Bene Gesserit
- Reverend Mother Gaius Helen Mohiam, Proctor Superior of the Bene Gesserit school and the Emperor's Truthsayer
- Lady Margot Fenring, Bene Gesserit wife of Count Fenring
- Fremen
- The Fremen, native inhabitants of Arrakis
- Stilgar, Fremen leader of Sietch Tabr
- Chani, Paul's Fremen concubine and a Sayyadina (female acolyte) of Sietch Tabr
- Dr. Liet-Kynes, the Imperial Planetologist on Arrakis and father of Chani, as well as a revered figure among the Fremen
- The Shadout Mapes, head housekeeper of imperial residence on Arrakis
- Jamis, Fremen killed by Paul in ritual duel
- Harah, wife of Jamis and later servant to Paul who helps raise Alia among the Fremen
- Reverend Mother Ramallo, religious leader of Sietch Tabr
- Smugglers
- Esmar Tuek, a powerful smuggler and the father of Staban Tuek
- Staban Tuek, the son of Esmar Tuek and a powerful smuggler who befriends and takes in Gurney Halleck and his surviving men after the attack on the Atreides
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