Antonín Theodor von Colloredo-Waldsee (also: Colloredo-Waldsee-Melz or Colloredo-Melz und Waldsee)[1] (17 July 1729 – 12 November 1811) was a cardinal of the Roman Catholic Church.

[2] Antonín was born on 29 June 1729 in Vienna as the son of Count Lodovico Colloredo-Waldesee Mels (1698–1767) and Princess Eleonore Gonzaga di Vescovato (1699–1779).

[1] He was ordained as a priest on 20 August 1758 in Olomouc and was elected its bishop on 6 October 1777.

He was consecrated at the Salzburg Cathedral on 17 May 1778 by Hieronymus Joseph Franziskus von Colloredo.

He was recommended to the cardinalate at the behest of Emperor Francis I, and was created cardinal on 17 January 1803 by Pope Pius VII.