| Honorific Prefix: | The Most Excellent |
| The Duke of Tetuán | |
| Honorific Suffix: | GE |
| Birth Name: | Juan O'Donnell y Vargas |
| Birth Place: | Madrid, Spanish Empire |
| Nationality: | Spanish |
| Spouse: | Dona Maria Diaz de Mendoza y Aguado |
| Parents: | Don Carlos Manuel O'Donnell y Álvarez de Abreu |
| Office: | Duke of Tetuán |
| Order: | 3rd |
| Rank: | Colonel |
| Office2: | Count of Lucena |
| Order2: | 3rd |
Juan O'Donnell y Vargas, 3rd Duke of Tetuán (1864 – 1928) was an influential Spanish politician.
O'Donnell was born in Madrid in 1864 and ascended to become the 3rd Duke of Tetuan, Grandee of Spain, 3rd Conde de Lucena, Cavalry Colonel, and the Director of the School of Military Riding. In 1896, he married Doña Maria Diaz de Mendoza y Aguado, hailing from the noble house of Lalain and Balazote, Marquises of Fontanar. He was the son of Carlos O'Donnell y Abréu, 2nd Duke of Tetuan. He served as Minister for War under Miguel Primo de Rivera from 1924 to 1928 until his death in office.[1]
In 1895, while serving as a lieutenant on the staff of general Martinez Campos, O'Donnell accompanied Winston Churchill and Reginald Barnes during their military visit to Cuba. In his memoirs, Churchill commented on Juan O'Donnell's excellent spoken English.[2]
In January 1922, O'Donnell served as the president of the "World Congress of the Irish Race" in Paris,This gathering brought together members of the global Irish diaspora to discuss strategies for supporting the economic development of an independent Ireland and its reconstruction in the aftermath of the Civil War.[3]
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