Diego Valadés or Didacus Valdes (± 1520, Spain or Tlaxcala (?) - ± 1590, Italy) was a missionary in New Spain (present Mexico) and member of the Franciscans. After a training by Peter van Gent, he worked as a missionary under the Chichimeken and became the head of the Tlaxcala monastery.
In 1570, he traveled to Rome, where he would write his most important work, Rhetorica Christiana. It is an important historical source about the civilization of the Aztecs and other Indian peoples. Although Valadés describes human victims, he also praises the level of civilization of the Indians.
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