Alejo Alvarez (c. 1890s – c. 1940s) was a Filipino track and field athlete who competed in the shot put and discus throw events. Alongside Regino Ylanan, he was the most successful throws athlete at the Far Eastern Championship Games. Alvarez competed in two editions of the competition. At the 1917 Tokyo Games he won the shot put with a throw of 10.69 m (35 ft 3⁄4 in) and was runner-up in the discus to compatriot Rafael Montes with a mark of 31.10 m (102 ft 1⁄4 in). He was killed in the Philippines during World War II, defending against the Japanese invasion.