Claude von Riegan (Japanese: クロード＝フォン＝リーガン, Hepburn: Kurōdo fon Rīgan) is one of the main characters in Fire Emblem: Three Houses (2019) and its spin-off Fire Emblem Warriors: Three Hopes (2022), both of which are part of Nintendo's tactical role-playing video game franchise Fire Emblem. He is the heir of the Leicester Alliance and the leader of the Golden Deer at Garreg Mach Monastery, alongside Edelgard von Hresvelg of the Black Eagles and Dimitri Alexandre Blaiddyd of the Blue Lions. His house is one of the houses that the protagonist, Byleth Eisner, can serve as a professor to.

While Claude is known to be an outgoing and laid-back individual, he is also known to be a remarkable cunning and genius strategist with a strong motive to open the borders of Fódlan to other nations such as Almyra, a rivaling kingdom that has conflict with the Leicester Alliance. It is later revealed that he's half-Almyrian, as he is actually Prince Khalid (カリード, Karīdo), the son of the King of Almyra and Queen Tiana, the daughter of Duke Oswald von Riegan.

If the player decides to support the Golden Deer House at the beginning of the games, then Claude will become the main protagonist of his routes. If not, he will serve as either an ally or enemy depending on the routes that the player chooses to follow.

Following his appearance, Claude had received a positive reception from fans and critics alike, with many praising the vocal performances by Zieja and Toyonaga respectively, his laidback yet cunning nature, and his ideals for Fódlan. He has also been a subject of commentary when it comes to his sexuality, which has received a mixed reception.

Claude is a playable character in the video game Fire Emblem: Three Houses. His height is 175 cm and his birthday is on July 24. He, like multiple other characters in the game, has a Crest, an artifact inside of him that gives him powers beyond that of a normal human. He is the heir to the House of Riegan, the leading house of the Leicester Alliance, a territory in Fodlan. His birth name is Khalid, and he was the child of the king of Almyra and the daughter of Duke Riegan, facing discrimination for his mixed heritage both in Almyra and the Leicester Alliance. This caused him to become invested in ending Fodlan's isolation. He also changed his name to Claude to hide his lineage. He later enrolled at the age of 17 at the Officers Academy in Garreg Mach Monastery, operated by the Church of Seiros and Archbishop Rhea, serving as the house leader of the Golden Deer. He is able to have dialogue with certain characters both in and out of the Golden Deer, including the protagonist, Byleth, whom he can enter into a romance with if the character is female and serves as the professor of the Golden Deer. He is accompanied by Edelgard von Hresvelg, the leader of the Black Eagles, and Dimitri Alexandre Blaiddyd, the leader of the Blue Lions, hailing from the Adrestian Empire and the Kingdom of Faerghus respectively. If Byleth teaches the Golden Deer, Claude becomes intrigued in them due to Rhea's interest in Byleth as well as Byleth wielding the Crest of Flames and the Sword of the Creator. After learning more about Byleth, Claude vows to help them learn more about their origin and the Church. Eventually, Edelgard declares war on the Church of Seiros. If Byleth joined the Golden Deer, they become Claude's ally in this war, who allies himself with Dimitri in each route. If Byleth chose to ally with Edelgard, they will have to do battle against Claude.

Byleth is put into stasis following Edelgard's declaration of war, leaving Claude, Dimitri, and Edelgard to wage war, with each of them assuming control of their respective territory. When Byleth reawakens five years later, they reunite with Claude, who is now around 22 years old, and who secures Byleth's alliance by reiterating his promise to help Byleth learn the truth. Together, they manage to unite the Leicester Alliance and defeat Edelgard, with Byleth killing her. The war turned to Those Who Slither in the Dark, the group enabling Edelgard's war, doing battle with Nemesis, resurrected by Those Who Slither in the Dark to wage war on Fodlan. After killing Nemesis, Byleth and Claude vow to bring about peace, with Claude returning to Almyra to create ties between it and Fodlan.

Claude was featured as part of a line of plush toys, including Byleth, Edelgard, Dimitri, and Roy.

Claude von Riegan was created for Fire Emblem: Three Houses, and is one of the three characters with whom the protagonist Byleth can choose to ally. He is a member of the Golden Deer house, and becomes the leader of the Leicester Alliance.^{[citation needed]} The team designing him was inspired by multiple characters, including Yang Wen-li from The Legend of the Galactic Heroes and Rajendra from The Heroic Legend of Arsland, being described as a mixture of the two characters. While he goes by Claude, his real name is Khalid. This was intended to be revealed in the game's story, but they couldn't find the opportunity to fit it in, nor could they figure out how to make it work. There was also dispute over naming him Claude due to the name having been used for a character in the video game Fire Emblem: Genealogy of the Holy War, but they decided it was fine due to it being a fake name and other characters in the series having shared names in the past. When discussing the theme of his story, producer Toshiyuki Kusakihara described it as being about fighting against those who are unwilling to accept people who are different from them, which they noted derived from his upbringing.