Thomas Cardinal Cajetan (Ca'jê-tan or Caj'e-tan, also known as Gaetanus), commonly Tommaso de Vio (February 20, 1469 - August 9, 1534) was an Italian cardinal best known for his opposition to the teachings of Martin Luther and the Protestant Reformation while he was the Pope's Legate in Wittenberg. He is not to be confused with his contemporary, Saint Cajetan, the founder of the Theatines.

Thomas Cajetan died on 1534-08-09.

Thomas Cajetan was born on 1469-02-20.

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Thomas Cardinal Cajetan, also known as Tommaso de Vio, was sent to the diet of Augsburg in 1518 to bring Luther back into the fold. Cajetan, appearing in full clerical pomp and regalia, used arguments by Thomas Aquinas to try to convince Luther to recant. Luther responded by insulting the writings of Aquinas, since he despised the entire scholastic system, as his writings made clear.

By apparently not knowing his audience, Cardinal Cajetan missed a chance to approach the issue from another angle, perhaps by expressing agreement with Luther that the poor teaching and misunderstandings about indulgences were a cause of scandal. He might then have appealed for Luther to direct his energies at undertaking the needed reform of the Church from within, instead of scrapping the entire sacramental system, the hierarchy of the Church, holy days, and so on. He thus could be said to have lost a precious opportunity to avoid the subsequent shipwreck of Christendom.

But that was not to be. Later, another cardinal , Cardinal Aleander who was the papal legate to Germany, encouraged young Charles V to try Luther at the Diet of Worms.