A Manhattan Community Board rejected a ceremonial street renaming for a hero NYPD cop killed in Iraq, leaving his police pals stunned and his parents devastated.

Staff Sgt. Jimmy McNaughton was a 27-year-old Army Reservist whose life was snuffed out by a sniper’s bullet in August 2005. The Tribeca-based transit officer was beloved by his colleagues and the first of New York’s Finest to fall in the war.

His fellow officers and family lobbied to “co-name” West Broadway between Lispenard and Canal streets “James McNaughton Way.”

The proposal passed unanimously in committee but Community Board 1 voted 21-12 against the measure during its full board meeting Oct. 23.

“It was a slap in the face,” McNaughton’s stepmom, Michelle, told The Post through tears. “I don’t think they cared. They were cold and heartless.”

McNaughton’s parents, both retired transit cops, are not buying “excuses” that “the pole is too crowded” with signs, it might confuse taxi drivers or that CB 1 is against all ceremonial street renaming.

The board in 2009 rejected a street renaming for abolitionist David Ruggles, who once live on Lispenard.

McNaughton’s dad, Bill, 63, suspects some of the board members are anti-cop and anti-military: “All it is is politics. Tell us the real reason. What is the reason Tribeca can’t do it, but all the other boroughs can do it?”

Transit Police Officer Brian Kenny, who worked with McNaughton, said he and his partner, Officer Paul Caracci, were “fairly confident” the proposal would pass at last month’s meeting since they had gotten the approval of local businesses and submitted a petition with the names of 227 police officers.

“We’re neighbors,” Kenny said, noting the proposed street sign would have overlooked the Canal Street subway station stairs leading to their command.

“Jimmy’s a hero. He’s our hero. And generations of future police officers who entered the subway to go to work at Transit District 2 would know that his fellow officers did not forget him,” Kenny said.

CB 1 did not return messages and email.

McNaughton’s stepmom is shaken. “God forbid something happened to Robert DeNiro’s family,” she said of the Oscar-winning Tribeca mainstay. “How fast would they put up a street sign for him?” The story was first reported by the Tribeca Trib.