Jack Atlas is one of the main characters from the anime series, Yu-Gi-Oh! 5D's. He is also one of the signers, who carries the wings of the Crimson Dragon and the current wielder of one of the Signer Dragons, Red Dragon Archfiend (in the original, Red Daemons Dragon). He is the adoptive older brother of Yusei Fudo and Crow Hogan. Originally a bitter rival to his former friend, Yusei, his defeat and realization of the path he had taken, made Jack realize the error of his fame-seeking ways and resolves to be a better duelist as well as being a better friend. He now resolves to help his friends against the growing battle of enemies in the later arcs such as Yliaster.
Jack returns in Arc-V as an alternate universe version of the same character.
He is voiced by Takanori Hoshino in the Japanese version of the anime, and by Ted Lewis in the English version of the anime.