Antonio Alzamendi Casas (born 7 June 1956 in Durazno) is a Uruguayan footballer who played as a forward; he retired in 1991.
His official debut was with the Uruguayan team Wanderers de Durazno.
Alzamendi played for Uruguay at the 1986 and 1990 FIFA World Cups, scoring against West Germany in 1986.
However his contract was then terminated shortly after due to financial problems with the club.
In 2008, he became the coach of Sport Ancash from Peru.