David John Giusti, Jr. (born November 27, 1939) is an American former professional baseball player.

He played in Major League Baseball as a right-handed pitcher from 1962 to 1977, most notably as a member of the Pittsburgh Pirates teams that won five National League Eastern Division titles in six years between 1970 and 1975 and, won the World Series in 1971.

While playing baseball for Syracuse University, Giusti pitched in the 1961 College World Series as a starting pitcher.

Giusti pitched a one-two-three seventh inning as the National League won the game 7–1.

[3] Shortly before the beginning of the 1977 season, he was traded to the Oakland Athletics as part of a ten-player trade – one that also sent Tony Armas, Rick Langford, Doug Bair, Doc Medich and Mitchell Page to the Oakland Athletics and sent Phil Garner, Chris Batton, and Tommy Helms to Pittsburgh.