Mokuba Kaiba (海馬 モクバ Kaiba Mokuba) is a fictional character in the manga and anime series Yu-Gi-Oh!.

Mokuba is Seto Kaiba's younger brother. In the manga, Mokuba is something of a spoiled brat and is always trying to trick Yugi Mutou (Yugi Moto in the English anime) to get back at him for defeating his older brother. He is another good game player who specializes in Capsule Monster Chess ("Capmon"), but not as good of a gamer as his brother. Mokuba has a bad taste of fashion, and his friends brandish a machine gun, a knife, and a stun gun in one manga chapter to coerce Yugi to play "Capmon" with him.

In the manga, at a young age, Mokuba and Seto were orphaned (their actual surnames unknown). Seto's mother died after Mokuba was born, and their father died in an accident when Seto was eight. Their relatives used up their inheritance and left them at the orphanage. his When the former head of KaibaCorp, Gozaburo Kaiba, arrived at the orphanage to perform a publicity stunt, Seto saw the chance to challenge him to a game of chess, with Gozaburo forced to adopt Seto and Mokuba should he win. Mokuba was five at the time, while Seto was ten in the manga and Japanese anime, and in the English Duel Monsters anime he was twelve.

Seto had won by cheating in the manga. In the anime, he won by studying Gozaburo's chess methods. Gozaburo forced Seto into a rigorous accelerated school program. Six years later, Seto Kaiba took over his father's company. In the manga and the second series of the original Japanese anime, Gozaburo, provoked by Seto, committed suicide. In the first series, Seto electrocutes Gozaburo after Seto takes over the company. In the English anime, he "ran away".

In the anime, Seto was bright and intelligent, which led to many prospective parents wanting to adopt him, Seto swore to protect his brother at all costs, and wanted Mokuba adopted with him, which all had refused. Gozaburo also had an ulterior motive: he wanted to adopt Seto because he was bright enough to be motivation for his own son, Noah Kaiba, to do better so that Noa could inherit KaibaCorp. With Noah's untimely death, however, Gozaburo focused his energies to Seto. Gozaburo asked Seto to return ten times of an amount of money given to him. Seto did so within a day and took over his father's company. In the Battle City season of Yu-Gi-Oh!, Moku-chan is the Battle City commissioner (he called himself that), calling violations and penalties when needed.

In the original Japanese version of the Yu-Gi-Oh! manga, Mokuba tends to omit honorifics when referring to people other than his older brother. He also has a habit of calling Katsuya Jonouchi (Joey Wheeler in the English anime) Jōnouchi no yarō (that bastard Jonouchi). Mokuba politely refers to his older brother as nii-sama (honorable older brother).

In the Yu-Gi-Oh! Duel Monsters anime, Mokuba is a kind-hearted boy who is naïve to the ways of the world.

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