David Thomas Lingmerth (born 22 July 1987) is a Swedish professional golfer who plays on the PGA Tour.

Lingmerth won his age level category (15) at the unofficial Swedish Youth Championship, Bankboken Cup, at Falun-Borlänge Golf Club, one stroke ahead of Henrik Norlander, who also came to be a PGA Tour player.

On home soil at Österåker Golf Club in Stockholm 2010, with Henrik Norlander among Lingmerths teammates, the Swedish team earned a silver medal.

In only his second career start on the PGA Tour, Lingmerth finished as a joint runner-up at the Humana Challenge after losing in a three-man playoff.

Lingmerth earned his first PGA Tour win at the 2015 Memorial Tournament at Muirfield Village, Ohio.

Lingmerth won after beating Justin Rose on the third extra hole of a sudden death playoff.

At the 2015 Quicken Loans National, Lingmerth finished solo third with a final round 69, four shots behind the winner, Troy Merritt.