| Álvaro de Mendoza Caamaño Sotomayor | |
| Office: | Patriarch of the West Indies |
| Term Start: | 20 January 1734 |
| Term End: | 23 January 1761 |
| Predecessor: | Carlos de Borja y Centellas |
| Successor: | Buenaventura Fernández de Córdoba Spínola |
| Office2: | Cardinal |
| Term Start2: | 10 April 1747 |
| Term End2: | 23 January 1761 |
| Birth Date: | 14 November 1671 |
| Birth Place: | Madrid, Spain |
| Death Place: | Madrid, Spain |
| Nationality: | Spanish |
| Occupation: | Priest |
Álvaro Eugenio de Mendoza Caamaño y Sotomayor (14 November 1671 – 23 January 1761) was a Spanish aristocrat and Catholic priest who became Patriarch of the West Indies and a Cardinal.
Álvaro Eugenio Cardinal de Mendoza Caamaño y Sotomayor was born on 14 November 1671 in Madrid, Spain and was baptized on 28 November 1671 in the parish of San Nicolás.His parents were Antonio Domingo de Mendoza, second Marquis of Villagarcía and viceroy of Valencia, and Juana Catalina de Rivera y Ronquillo. He studied at the University of Ávila and obtained a doctorate in theology.
King Charles II of Spain granted Mendoza the habit of the Order of Santiago in 1699, and he was invested into this order on 21 April 1700.Mendoza was ordained priest in July 1715.He was appointed Archdeacon of Toledo and of Santiago de Compostela.He was made Abbot nullius of Alcalá la Real and of Burgohondo on 28 March 1734. He was Major chaplain of the Royal Monastery of La Encarnación, Madrid, and the king's Sumiller de cortina. King Philip V of Spain named him his almoner and major chaplain.
The king nominated Mendoza to the patriarchate of the West Indies in November 1733.He was appointed Patriarch of the West Indies and Titular Archbishop of Pharsalus on 20 January 1734.As patriarch he succeeded Carlos de Borja y Centellas, who had died on 8 August 1733.He was ordained bishop on 9 May 1734 at the Royal Monastery of La Encarnación, Madrid.His principal consecrator was Archbishop Domingo Valentín Guerra Arteaga y Leiba, Bishop of Segovia.His principal co-consecrators were Benito Madueño y Ramos, Titular Bishop of Sion, and Dionisio Francisco Mellado Eguíluz, Titular Bishop of Lares.
King Ferdinand VI of Spain requested Mendoza's promotion to the cardinalate.Mendoza attended the consistory of April 1747.On 10 April 1747 he was elevated to Cardinal.The king gave him the red biretta of this rank in a ceremony on 16 August 1747 in the church of San Jerónimo el Real in Madrid.He never traveled to Rome to receive the red hat from the Pope.He was unable to attend the conclave of 1758 in which Pope Clement XIII was elected.
Mendoza died on 23 January 1761 in the Buen Retiro Palace in Madrid, and was buried in his mother's tomb in the monastery of San Gil, Madrid.He was succeeded as Patriarch of the West Indies by Buenaventura Fernández de Córdoba Spínola, who was appointed on 6 April 1761.
Mendoza's episcopal lineage or apostolic succession was:
Mendoza was the principal consecrator of: