David Geoffrey Hearn (born June 17, 1979) is a Canadian professional golfer who plays on the PGA Tour.

[1] He was a member of the winning Canadian team at the 2001 Four Nations Cup tournament, and played out of the Brantford Golf and Country Club as an amateur.

In June 2013, Hearn finished in a tie for second at the John Deere Classic, after losing in a three-man playoff, which also included Zach Johnson and Jordan Spieth.

This was Hearn's best finish to date on the PGA Tour, beating his previous tie for fifth at the 2011 Shriners Hospitals for Children Open.

At the RBC Canadian Open in July 2015, Hearn held the 54-hole lead at 15-under-par, with a two-stroke advantage over Jason Day and Bubba Watson.