A broad majority of New York City voters disapprove of police officers turning their backs on Mayor Bill de Blasio, a Quinnipiac University poll released on Thursday found.

The poll found a full spectrum of voters — black, white and Hispanic — are opposed to the public display seen at the funerals slain police officers Rafael Ramos and Wenjian Liu, 69 percent to 27 percent.

An even larger majority — 77 percent to 17 percent — found comments made by PBA President Pat Lynch that the mayor’s office had blood on its hands following those officers’ deaths are “too extreme.”

“Cops turning their backs on their boss, Mayor Bill de Blasio, is unacceptable, New Yorkers say by large margins,” said Quinnipiac’s Mickey Carrol. “Even cop-friendly Staten Island gives that rude gesture only a split decision.”

Most voters hold the view that de Blasio — who has been critical of aspects of policing such as stop and frisk as well as spoken of the concern he was for his son dealing with law enforcement — supports police in the city.

A majority, 52 percent to 38 percent, believe police discipline has broken down, while 62 percent say New York City Police Commissioner Bill Bratton can restore or maintain it.

Bratton’s job approval, meanwhile, has jumped, the poll found, from 51 percent to 41 percent last month to 56 percent to 37 percent this month.

Not held in high regard by voters are both Lynch and the Rev. Al Sharpton.

Lynch has an 18 percent favorability rating, with a plurality of voters, 43 percent to 27 percent, saying he has a negative impact on the city. Sharpton, meanwhile, has a 29 percent favorable rating, his lowest score in the Quinnipiac poll ever. By a margin of 51 percent to 37 percents, voters believe he is a negative force for the city.

The poll was conducted from Jan. 7 through Jan. 14 and surveyed 1,182 New York City voters. It has a margin of error of 2.9 percentage ponits.