Joaquín Loyzaga Sr. (born Joaquín de Loyzaga Martínez; July 12, 1890 – July 4, 1935) was a Filipino international footballer who has played in the Far Eastern Championship Games, the precursor of the Asian Games.
Loyzaga has played for the Philippines national football team in three editions of the Far Eastern Championship Games from 1913 to 1917. In the 1917 Games, he helped the national team win 15–2 over Japan.
He was born to José Antonio Eugenio de Loyzaga y Ageo, a wealthy criollo businessman and sixth-generation member of landed Old Manila gentry, and María de la Luz Martínez Vial, a middle-class criolla. He was married to María del Carmen Matute y Sequera, who herself was a well-to-do ninth-generation criolla. He is the father of Carlos Loyzaga who was a very well-known as a basketball player. The younger Loyzaga was initially involved in football.
At the inaugural Manila Youth Games in 2002, plagues of recognition of select athletes from Manila, including Loyzaga, were presented.