Agustín Díaz (born June 6, 1954), known as Augie Diaz, is an American sailor and world-class competitor in the Snipe, Star and Laser classes.

In 1973, he won the IYRU Single-handed dinghy World Youth title in the Laser class.

After graduating from Christopher Columbus High School (Miami) in 1972, Diaz sailed for Tulane University, where he studied Mechanical engineering.

He was All American on the Tulane Green Wave sailing team in 1973, 1974 and 1975, won the ICSA Coed Dinghy National Championship in 1973 and the ICSA Men's Singlehanded National Championship in 1974, leading the team to win the Leonard M. Fowle Trophy in 1974.

He received the US Sailor of the Year Award in 2003, and was inducted in the National Sailing Hall of Fame in 2021.