Martín Alonso Fernández de Córdoba Montemayor y Velasco (died 1558) was a Spanish nobleman and first Count of Alcaudete. He was Viceroy of Navarra between 1527 and 1534. In 1534, he was appointed Governor ("Captain General") of the Spanish North African base of Oran in 1534. He also led several Spanish expeditions against Mostaganem, which took place in 1543 and 1547. They failed as the Spanish forces were repulsed and then pursued in retreat by Turkish and tribal forces. Count Alcaudete led the disastrous Expedition of Mostaganem in 1558, where he was killed.