Zane Truesdale, known as Ryō Marufuji (丸藤亮Marufuji Ryō?) in the original Japanese language version, is a fictional character in the Yu-Gi-Oh! GX anime and manga series. In the English version, Zane is voiced by Scottie Ray, while Takeshi Maeda takes the role in the Japanese version.

The top duelist of Duel Academy in protagonist Jaden Yuki's first year, Zane serves as one of Jaden's rivals during the series' first season, though he takes a more brutal approach to dueling after experiencing a transformation of mind in the second season. In subsequent seasons he develops fatal heart conditions and seeks an opponent worthy enough to give him his final and greatest duel before he expires

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