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Wichmann von Seeburg (c.1115 – 25 August 1192) was Bishop of Naumburg from 1150 until 1154 and Archbishop of Magdeburg from 1154 until his death. He became the first Magdeburg prince-archbishop in 1180
Wichmann was the second son of the Saxon count Gero of Seeburg (d. 1122) and his wife Matilda, a daughter of the Wettin count Thimo the Brave. He studied theology at the University of Paris before becoming a canon in Halberstadt. Throughout his long ecclesiastical career, he was a loyal supporter of the Hohenstaufen emperor Frederick Barbarossa against Pope Alexander III and an implacable military leader against the emperor's foes in the northeast, especially the Welf duke Henry the Lion.
Wichmann was elected Bishop of Naumburg-Zeitz in 1149 and ordained the next year. He made large donations to the monasteries of Pforta and Zeitz. A regular guest at the court of King Conrad III of Germany, he was quickly appointed to the Archdiocese of Magdeburg by Conrad's nephew, the newly crowned King Frederick Barbarossa in 1152. Wichmann initially had to overcome the resistance by Pope Eugene III and his successor Anastasius IV; nevertheless, he immediately endeavoured to extend his diocese and its economy, and actively promoted trade within the cities. In 1157, he allied with the Ascanian margrave Albert the Bear to re-conquer and Germanise the cities of Brandenburg and Jüterbog, whose vicinity he conquered and colonised with Flemish settlers (cf. Fläming). In 1170 he granted large estates to the newly established Cistercian monastery of Zinna.
He attended the 1160 Council of Pavia, supporting the election of Antipope Victor IV. In 1164, he undertook a pilgrimage to Palestine and fell for a time into Turkish hands. After supporting the election of Antipope Paschal III, he tried to adopt the position of a mediator with Pope Alexander III.
1166年、ヴィヒマンはドイツ諸侯に加わり、ハインリヒ獅子公と戦ったが、領地が荒廃するのを目の当たりにするだけだった。1175年、彼は皇帝のイタリア遠征に援軍を送った。1177年にはヴェネツィアで和平条約の交渉に当たった。1178年、ハインリヒ獅子公との戦争のためザクセンに戻った。彼は1180年のハインリヒの廃位と追放に尽力し、その実現によって大きな利益を得て、その後ザクセンにおける主要な世俗権力者となった。しかし、彼はヴェルフ家に対しては依然として強い反感を抱いていた。
1180年と1185年に、彼は広大な領地の一部をオーストリアのザイテンシュテッテン修道院とパッサウ司教区に寄進した。1192年8月25日、ケーテン近郊で死去し、自身の司教座聖堂に埋葬された。マクデブルク市と司教区は、彼の指導の下で大きく発展した。ヴィヒマンはまた、1188年にマクデブルク市法を初めて法典化した人物としても知られている。