Diego Coello de Portugal y Quesada (19 August 1820 – 5 April 1897) was a Spanish diplomat, politician and journalist.

He later became a monarchist, dynastic, sincere Catholic, and Liberal Conservative was a member of the Senate for Jaén in 1876 and, for life, from 1877 to 1880.

[3] In 1849, he was a founder of the Liberal evening newspaper La Época in Madrid, and served as a director from 1849 to 1866.

In 1868, he requested that he be dismissed as ambassador to Portugal, transferred the direction of La Época to Emilio Castelar and accompanied Queen Isabella II into exile in France.

In 1884, he became the diplomatic representative of Spain in the Ottoman Empire,[5] succeeding his friend the Count of Rascón.