Sam Giammalva Sr. (born August 1, 1934), is an American former tennis player in the mid-20th century. Giammalva played for the United States Davis Cup team, earning a 7–3 record in match play between 1956 and 1958. He was on the victorious U.S. teams of 1957 and 1958. In 1958, he teamed up with Barry MacKay to reach the doubles final at the U.S. Nationals. The pair fell to Alex Olmedo and Ham Richardson, 3–6, 6–3, 6–4, 6–4. It was Michigan’s MacKay who beat Giammalva, of the University of Texas at Austin, in the final of the 1957 NCAA Championship in five sets. Giammalva also reached the NCAA doubles final in 1955. He won three straight Southwest Conference singles titles from 1956-1958.