James Joseph "Duffy" Waldorf Jr. (born August 20, 1962) is an American professional golfer who plays on the PGA Tour Champions.

He was a two-time NCAA All-American, 1985 College Player of the Year, and was selected for the 1985 Walker Cup.

He has featured in the top 50 of the Official World Golf Rankings, peaking at 35th in 2000.

Waldorf finished T-14 in the 2007 Q-School to regain his 2008 PGA Tour card.

[3] A recurring knee problem hindered Waldorf, who sat out the entire 2009 and 2010 seasons.