
The longest putt holed on the PGA Tour was by Craig Barlow in the fourth round of the Buick Open of 2008. His eagle putt on the par-5 dogleg 1st hole measured 111ft and 5 inches.
However it was not played with a putter. It was a chip played with his lob wedge. But, as any shot on the green is classified as a putt, it is the longest officially recorded putt on the PGA Tour. Even if he didn't actually putt the ball.