Floris van Montmorency, baron van Montigny (?, 1528 - Simancas, October 14 1570) was a noble and diplomat from the Spanish Netherlands.

He was the younger brother of Philip de Montmorency, Count of Horn.

Floris had a military training at the court of his relative Anne de Montmorency, Constable of France. He accompanied Emperor Charles V to Spain after his abdication. At his return, Floris became a Knight in the Order of the Golden Fleece with the support of William the Silent and against the wishes of Philip II of Spain. He was also appointed as Governor of the Tournaisis.

As the rest of the high nobility in Flanders, Floris was a strong opponent to Cardinal Granvelle.

In April 1566, he was sent by the Council of State with John IV of Glymes to Spain in a last attempt to avoid war. As Glymes was wounded on the leg before leaving, Floris travelled alone. When the Beeldenstorm raged across the Low Countries, Floris was arrested and kept in house arrest. When Egmont en Horn were arrested in Brussels, Floris was also condemned to death by the Council of Troubles. Instead of returning him to the Low Countries for his sentence to be executed, Philip II has Floris strangled in secret, and spread the rumor that he had died of disease.

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• Biography on dutchrevolt.leiden.edul
• Biographie Nationale de Belgique, s.v. "Florent de Montigny", vol. 15, kol.

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