Zigfried von Schroeder is the main antagonist of the KC Grand Championship story arc of the Yu-Gi-Oh! second series anime. In both incarnations, his name is derived from the name of Siegfried, a character in the opera, Der Ring des Nibelungen (The Ring of Nibelung).
He is the CEO of Schroeder Corp, a rival of KaibaCorp. As the champion of Europe, he participates in Kaiba's KC Grand Championship under the name "Zigfried Lloyd" (Sieg Lloyd; ジーク・ロイド Jīku Roido). He is Leon von Schroeder's (Leonhart von Schroider) older brother.