Donald Antone Hahn (born November 16, 1948) is an American former professional baseball outfielder, known primarily for his defensive abilities.

Hahn played in Major League Baseball (MLB) for the Montreal Expos, New York Mets, Philadelphia Phillies, St. Louis Cardinals, and San Diego Padres.

The right-handed throwing and batting Hahn was drafted by the San Francisco Giants in the 17th round of the 1966 Major League Baseball draft On April 8, 1969, Hahn played in his first major league game; he was the starting center fielder in the Montreal Expos' first game.

[1] Hahn later became quite accustomed to the Shea Stadium outfield grass; a few days before the 1971 MLB season began, the Mets traded 1969 World Series hero Ron Swoboda, along with minor leaguer Rich Hacker, to the Expos, in exchange for the young outfielder.

[3] Hahn was traded along with Tug McGraw and Dave Schneck from the Mets to the Philadelphia Phillies for Del Unser, John Stearns, and Mac Scarce at the Winter Meetings on December 3, 1974.