The PGA Tour's membership for the 2014-15 season also voted Daniel Berger as Rookie of the Year in awards announced Friday.
The 22-year-old Spieth, ranked No. 1 in the world, became the youngest PGA Tour Player of the Year since Tiger Woods won the award at the age of 21 in 1997.
"The PGA Tour enjoyed a sensational season from every perspective as our young stars shone brighter than ever before, but none brighter than the PGA Tour Player of the Year Jordan Spieth," commissioner Tim Finchem said in a statement. "He captivated us throughout a memorable year that included the FedExCup and five victories, highlighted by two major championships. And the sportsmanship he displayed in both victory and defeat was a stirring indication of the role model and ambassador he has become in a very short period of time."
On Monday, Spieth captured the PGA of America Player of the Year Award and Vardon Trophy. The season-ending awards by the PGA of America are presented for excellence by a Tour professional.
It was a historic and record-setting year for Spieth, who won two major championships and the season-ending Tour Championship, becoming the youngest winner of the FedEx Cup. In total, the Dallas native won five events --- the Valspar Championship, Masters Tournament, U.S. Open, John Deere Classic and the Tour Championship. He was just the sixth different player to win five or more times in a season on the PGA Tour since 1980, joining Tom Watson (1980), Nick Price (1994), Vijay Singh (2004), Tiger Woods (10 times) and Jason Day (2014-15).
In the majors, Spieth won the Masters and U.S. Open, becoming the youngest player since Gene Sarzazen (1922) to capture two major championships. Spieth's remarkable run at the grand slam ended at The Open Championship, where he fell one shot shy of a three-way playoff but managed a tie for fourth, followed by a second-place finish to Day at the PGA Championship.
Along the way to the FedEx Cup title, Spieth broke Woods' PGA Tour season record for FedEx Cup points (4,169) and entered the FedEx Cup playoffs No. 1 in the standings. After two missed cuts in the playoffs, Spieth rebounded to finish tied for 13th at the BMW Championship and went on to clinch the FedEx Cup with a four-shot victory over Henrik Stenson, Danny Lee and Justin Rose at the Tour Championship.
Spieth amassed a PGA Tour-record $12,030,465 to earn the Arnold Palmer Award as the leading money winner and also finished first in adjusted scoring average (68.938) to earn the Byron Nelson Award (PGA Tour) and Vardon Trophy (PGA of America).
In 25 starts, Spieth led the Tour with 15 top-10s, including four runner-up finishes, with 21 made cuts.
One of nine PGA Tour rookies who advanced to the FedEx Cup playoffs, Berger, 22, earned his spot as the only rookie at the Tour Championship after a runner-up finish in the second to last playoff event, the BMW Championship.
"Daniel Berger caught the attention of golf fans early on as he charged up the leaderboard at the Honda Classic for his first brush with victory, finishing runner-up in a playoff," Finchem said. "He capped his first season on Tour with a strong showing in the FedEx Cup playoffs and demonstrated great character and sportsmanship on and off the course, as evidence by this peer vote."
The 2014 Web.com Tour graduate finished tied for 12th at the Tour Championship to end the season ranked 11th in the FedEx Cup.
In 31 starts, Berger recorded six top-10 finishes, including two runner-up finishes, with 17 made cuts.
Berger was elected as PGA Tour Rookie of the Year over Tony Finau, Nick Taylor and Justin Thomas.