The NYPD received 2,495 reports of biased policing since it began investigating allegations from the public five years ago — but cops haven’t substantiated a single complaint, a new city report has found.

The Office of the Inspector General for the Department of Investigation released a report Wednesday that said the complaints were based on race, national origin and sexual orientation.

But the report shows that NYPD officials have “never substantiated an allegation of biased policing.”

It also found that the Civilian Complaint Review Board — the agency that probes police misconduct — doesn’t investigate bias complaints.

“Biased policing, actual or perceived, undermines the core value of equal treatment under the law and also poses a threat to public safety because racial profiling and other types of biased policing undermine the public’s confidence and trust in law enforcement,” Inspector General Philip Eure said.

“NYPD must ensure that these complaints are thoroughly investigated and tracked. In addition, the independent CCRB should expand its authority to investigate biased-policing complaints filed with that agency.”

The examination found that a majority of the biased-policing complaints — 68 percent — contained allegations of discrimination based on race, ethnicity, color or national origin and that the largest category of people filing complaints was black.

Other categories of bias by cops were religion, disability, sexual orientation, gender identity, gender, age, citizenship status and housing status. The report made 23 suggestions to improve the city’s handling of the complaints, including amending department rules to categorize the use of racial slurs and other offensive language associated with a protected status as “bias policing.”

Currently, the NYPD will probe an offensive-language complaint only if it is accompanied by other police action, such as an arrest, use of force or failure to take police action, the report states.

The NYPD responded with a page-long statement, pointing out that biased-policing complaints to the NYPD Internal Affairs Bureau have declined more than 33.1 percent as of May 31, over the same period in 2018, and insisting the department has “imposed more discipline on the substantiated cases of racial or protected-class slurs than any other major city police department.”

It noted that the instances cited in the report represent less than .001 percent of the agency’s annual interactions with the public, and “the OIG itself did not identify a single allegation out of the 888 they reviewed that they believe should have been substantiated on the basis of the available evidence, underscoring the difficulty in proving these allegations.”

The department also highlighted steps it has taken “to bring police and community closer together,” including outfitting patrol officers with body cameras and reducing stop-and-frisk.