Scherzer breezed past Los Angeles Dodgers ace Clayton Kershaw and Nationals teammate Stephen Strasburg, drawing 27 of the 30 first-place votes in balloting by members of the Baseball Writers' Association of America.
"Yes!'' Scherzer shouted, thrusting his arms up when the honor was announced on MLB Network.
The reaction was in keeping with his expressive reputation. He showed that intensity often this year, whether he was cursing under his breath like a madman during his delivery or demanding -- also with expletives -- that now-former Nationals manager Dusty Baker leave him in the game.
The 33-year-old righty earned the NL honor last year with Washington and the 2013 American League prize with the Detroit Tigers. Scherzer became the 10th pitcher with at least three Cy Youngs. Among the other nine, only Kershaw and Roger Clemens aren't in the Baseball Hall of Fame.
"That's why I'm drinking a lot of champagne tonight,'' Scherzer said.
Scherzer led the National League this past season with 268 strikeouts and ranked second in ERA (2.51) and fourth in wins (16) for the NL East champion Nationals.
"This one is special,'' he said. "When you start talking about winning three times, I can't even comprehend it at this point.''
In an era noted for declining pitcher durability, Scherzer eclipsed 200 innings for the fifth straight season. He had to overcome a variety of ailments to get there, and Washington's training staff was high on his thank-you list.
"What more can you say about Max?" said Nationals general manager Mike Rizzo. "To have taken home this award three times already in his career, to be among the shortest of lists when it comes to three-time winners, and an even shorter list of those who've won the award in both leagues, you realize just how special a pitcher we're lucky enough to watch every fifth day."
Kershaw already has won three NL Cy Youngs. And he was the most recent pitcher to win back-to-back. He was 18-4 this past season, with a league-best 2.31 ERA and 202 strikeouts.
Scherzer, along with AL Cy Young Award winner Corey Kluber, had rough outings in the playoffs.
Scherzer said he couldn't even watch the League Championship Series, although he did tune in for the World Series.
"That will eat at me this whole offseason,'' he said.
Voting for the awards was completed before the postseason began.
The final BBWAA honors will come Thursday, when the MVP awards are announced in the AL and NL.
Information from The Associated Press was used in this report.