DeGrom is the 20th pitcher to win multiple Cy Youngs and 11th to win it consecutively.
DeGrom received 29 of 30 first-place votes in balloting by the Baseball Writers' Association of America announced Wednesday night.
In the balloting, deGrom prevailed over fellow finalists Max Scherzer of the Nationals and Hyun-Jin Ryu of the Dodgers. Ryu received the other. Ryu garnered the lone remaining first-place vote, six for second place and eight for third.
This is the seventh time a Mets pitcher has won the Cy Young. At the end of October, deGrom was voted by his peers as the NL Outstanding Pitcher, ahead of Ryu and Atlanta Braves right-hander Mike Soroka. Yet deGrom again managed to stand out despite playing on a non-contending team.
DeGrom started the season slow, posting a 4.85 ERA in April.
DeGrom, who struggled at the beginning of the season before going 8-3 with a 1.89 ERA in his final 23 starts, is the second Met to win an award this offseason, following Pete Alonso, who on Monday won NL Rookie of the Year.
Scherzer arguably wasn't even the best member of the Nationals rotation this season, with Stephen Strasburg leading the league in wins (18) and innings (209) while barely finishing behind deGrom in strikeouts (255 to 251) and also making all 33 of his scheduled starts. In addition to a lighter innings load than deGrom, Ryu was inconsistent down the stretch, which may have hurt him with voters. Ryu was limited to 29 starts, while Scherzer made just 27 after battling reoccurring back and neck issues. Both pitchers were brilliant when healthy and may have pushed deGrom with completely healthy seasons.