| The Duke of Osuna | |
| Honorific-Suffix: | GE |
| Birth Date: | 10 September 1810 |
| Birth Place: | Madrid, Spain |
| Death Place: | Madrid, Spain |
| Birthname: | Pedro de Alcántara María Tomás Téllez-Girón y Beaufort Spontin |
| Nationality: | Spanish |
| Father: | Francisco de Borja Téllez-Girón, 10th Duke of Osuna |
| Mother: | María Francisca Beaufort Spontin y Álvarez de Toledo |
| Honorific Prefix: | The Most Excellent |
Pedro de Alcántara Téllez-Girón y Beaufort Spontin, 11th Duke of Osuna, GE (10 September 1810 – 29 September 1844), was a Spanish peer, head of the House of Osuna. He was one of the most important peers of his time, and was thirteen times a duke, twelve a marquess, thirteen a count and once a viscount.[1]
Pedro was the son of Francisco Téllez-Girón, 10th Duke de Osuna and of María Francisca Beaufort Spontin y Álvarez de Toledo, 11th Marchioness of Almenara. The Téllez-Girón family had held title over the Dukedom of Osuna since 1562 with the rise of Pedro Téllez-Girón.
Pedro inherited the Dukedom of Osuna after the death of his father in 1820.
He died in 1844 without leaving behind any heirs. As a result, all of his titles, including the Dukedoms of the Infantado and of Osuna would pass on to his brother, Mariano Téllez-Girón.[1]