Johnson carded a closing 68 at Augusta National to finish five shots clear of Cameron Smith and Sungjae Im on 20 under par, surpassing the tournament record of 18 under shared by Tiger Woods and Jordan Spieth.
Smith and Im's totals of 15 under par are the best by a runner-up in tournament history and Smith also became the first player to break 70 in all four rounds, but Johnson was a class apart and now has two wins, three runners-up finishes, a third and a sixth place in his last seven starts.
"I dream of winning a lot of majors," the 2016 US Open champion said. "Just hadn't quite happened yet. Hopefully this one will help, though, give me a little spring."
Tweet of the day
Fellow player and Dustin Johnson "lookalike" Max Homa congratulates the new Masters champion.
Quote of the day
Johnson is not known for showing his emotions, but winning the Masters clearly means a lot.
Shot of the day
Cameron Smith produced a few contenders for shot of the day, but this one at the seventh took the prize.
Round of the day
On a tricky final day, Johnson's 68 was the joint lowest score and compiled under the highest pressure.
Statistic of the day
Five statistics for the price of one from Johnson's victory.
For the fourth day running the par-five second was the easiest hole, playing to an average of 4.433 thanks to three eagles and 34 birdies.
The par-four fifth hole was the most difficult, playing to the exact same average as the second due to not yielding a single birdie. There were 22 bogeys and two double bogeys.
It was the 12th that caused most problems for Woods, however. The defending champion took an incredible 10 shots to complete the hole on Sunday.
On the up
Johnson's standing in the game after finally proving he could convert a 54-hole lead in a major championship at the fifth time of asking.
On the slide
The chances of Augusta National playing quite so easily in April after Johnson's winning total of 20 under par.