Eusebio Guiñez (16 December 1906 – 1 October 1987) was an Argentine long-distance runner. Born in Rivadavia, Mendoza, he competed in the 1948 Summer Olympics in the 10,000 metres, which he failed to finish, and the marathon, where he finished fifth.^[1] His highest international ranking was 16th in the 10,000 m in the 1946 season, with a time of 31:09.8 minutes.^[2]

At regional level, he won medals at five editions of the South American Championships in Athletics. At the 1933 South American Championships in Athletics he was a 10,000 m gold medallist and a bronze medallist in the 3000 metres and 5000 metres. He was a bronze medallist in the road race at the 1941 South American Championships in Athletics, a silver medallist in road race and cross country running at the 1943 South American Championships in Athletics, a silver medallist in road race and 5000 m at the 1947 South American Championships in Athletics, and finally a bronze medallist at the 1949 South American Championships in Athletics.^[3]