Johnson had a final round of 74 and finished with a total of 16 under par 270. David Duval shot a 69 to finish joint runner up with JB Homes, all were one shot behind.
Johnson is the first person to win back to back titles at Pebble Beach in over 20 years. Padraig Harrington, Ireland, finished much further behind seven shots from the leader. His joint 16th place has now put him back in the European Ryder Cup standings.
Last year Johnson won after rain cleared the final round however this round he had to work right to the end. His final hole was edgy as he put his approach shot into the front bunker however recovered well and put his shot to 3 foot from the pin to make birdie. He has become the first player since Mark O’Meara in 1989 and 1990 to win two consecutive titles.
"All you can ask for is a chance to win on the last hole," said Johnson. "It's such a gorgeous hole. If you miss it a little left, it's not so pretty."