Gregory Carpenter Gagne (/ˈɡæɡni/; born November 12, 1961) is an American former shortstop in Major League Baseball.

Greg Gagne was drafted by the New York Yankees in the fifth round of the 1979 Major League Baseball Draft and spent the next three seasons in the Yankees' minor league system before being traded to the Twins on April 10, 1982, along with starting pitcher Paul Boris and reliever Ron Davis for the Twins starting shortstop, Roy Smalley.

Following three years with the Royals in which he put up similar numbers as he had with the Twins, he again entered free agency and signed a contract to play for the Los Angeles Dodgers for the 1996 and 1997 seasons.

He currently lives in Somerset, Massachusetts, and is the former head baseball coach at Bishop Feehan High School.

During that day's game he sat in the broadcast booth with commentators Dick Bremer and Bert Blyleven for a half inning.