The city’s longest-serving NYPD commissioner, Ray Kelly , endorsed Andrew Cuomo for mayor Monday — but the Big Apple’s major police unions are sitting out the race.

Kelly said he respects Republican nominee Curtis Sliwa, who he has known for 40 years through the Guardian Angels.

“But it’s common sense now: You have to vote for Andrew Cuomo to have any shot, any chance to defeat [Zohran] Mamdani,” Kelly said on 77 WABC “Sid & Friends” show. 3

Mamdani, the lefty Democratic nominee and front-runner, will “wreak havoc on us,” Kelly told host Sid Rosenberg.

“It doesn’t look good, but we have to be on the smart side at this time,” said Kelly, who served two stints as police commissioner under Mayors Mike Bloomberg and David Dinkins.

He claimed Mamdani will redirect funding from the N

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