Théodore Wichwael, O.S.A. or Dietrich Wichwael (died 1519) was a Roman Catholic prelate who served as Auxiliary Bishop of Cologne (1504–1519).^[1]

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Théodore Wichwael was appointed a priest in the Order of Saint Augustine.^[1] On 2 Aug 1504, he was appointed during the papacy of Pope Julius II as Auxiliary Bishop of Cologne and Titular Bishop of Cyrene.^[1] He served as Auxiliary Bishop of Cologne until his death on 3 Mar 1519.^[1]