Donald Robert "Duffy" Dyer (born August 15, 1945) is an American former professional baseball player and manager.

[2] Dyer played alongside Sal Bando and Rick Monday as a member of the Arizona State Sun Devils baseball team that won the 1965 College World Series.

[6] He was one of three catchers manager Gil Hodges carried on the 1969 Miracle Mets team that went on to win the World Series.

[7] Dyer grounded out to Mark Belanger in game one of the 1969 World Series in his only post season at bat.

He also led NL catchers in double plays and in baserunners caught stealing, finished second in assists and, third in fielding percentage.

[13] Following the 1974 season, Dyer was traded to the reigning NL East Champion Pirates for Gene Clines to serve as All-star Manny Sanguillén's back up.

[15] The Pirates repeated as division champions; Dyer drew a bases loaded walk off Rawly Eastwick in his only plate appearance in the 1975 National League Championship Series against the Cincinnati Reds.

[16] Dyer was the Pirates catcher on August 9, 1976, when John Candelaria pitched a no hitter against the Los Angeles Dodgers.

[18] Used in a platoon system with Ed Ott by Tanner, Dyer led National League catchers in 1977 with a .996 fielding percentage, committing only two errors in 93 games.

With Ott's emergence as a reliable bat atop the Pirates line up, Dyer's playing time fell substantially in 1978.

Facing the San Francisco Giants at Shea Stadium, manager Yogi Berra moved Dyer to right field in the third inning following an injury to outfielder John Milner.

[2] In the 1998 motion picture "Into My Heart", Ben (Rob Morrow) refers to Duffy Dyer as "a cultural icon".