Rider (ライダー , ?), Mounted Knight, is one of the seven normal Servant classes summoned for the Holy Grail War. Servants placed within this class are those known for riding mounts, living beasts or human constructs, during their lives. They generally have lower attributes compared to the Three Knight Classes, but the abilities of the mounts described in their legends compensate by granting them powerful Noble Phantasms or abilities. They have the class abilities of Magic Resistance and a high rank in Riding, allowing them to fully utilize the abilities of their mounts. Depending on the rank, they can take full control of everything from simple horses, modern machinery like motorcycles and planes, and even Divine Beasts. Dragons are the only exception, as the ability to ride them falls under a different skill.
- Details are unknown for the Rider class Servants summoned during the First, Second, and Third Wars.
- The Rider Class Servant summoned during the Fourth War in Fate/Zero is Alexander the Great summoned by Waver Velvet. He utilizes Gordius Wheel, a large chariot drawn by two Divine Bulls.
- The Rider Class Servant summoned during the Fifth War in Fate/stay night is Medusa summoned by Sakura Matou. She utilizes a powerful Pegasus summoned through her own abilities that she utilizes with Bellerophon to increase its power. She is made the Servant of Shinji Matou by using a Book of False Attendant Command Spell, and only returns under Sakura's control in Heaven's Feel. Heracles, summoned as Berserker, also has the qualifications to be summoned as Rider.
- The Rider Class Servant summoned during the Holy Grail War of the Moon Cell in Fate/Extra is Francis Drake summoned by Shinji Matou. She utilizes her ship, the Golden Hind, and the rest of her fleet of ships known as the Golden Wild Hunt. Lu Bu, summoned as Berserker, also has the qualifications to be summoned as Rider.
- The Rider Class Servants summoned during the Holy Grail War of Fate/Apocrypha are Astolfo and Achilles. Saint George was planned for the cancelled Online Game project. Karna, summoned as Lancer, and Siegfried, summoned as Saber, also have the qualifications to be summoned as Rider.
- The Rider Class Servant designed to be summoned during the Holy Grail War of Fate/Prototype is Perseus.
- The Rider Class Servant summoned during the Holy Grail War of Fate/strange fake is a Pale Rider, the concept of the calamity called Disease, summoned Tsubaki Kuruoka. It utilizes people as it "rides" them by infecting them. Huang Di, the Yellow Emperor, was the original Rider Class Servant to be summoned in Fate/strange fake.