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Top NBC News execs received complaints about Matt Lauer’s alleged sexual misconduct long before he was fired for harassment — but chose to protect him, current and former staffers told The Post on Thursday.

“Everybody at NBC knew about Matt Lauer’s sexually inappropriate behavior — and knew not to talk about it,” a current “Today” show staffer said.

“Women did complain about his behavior, and there were a lot of closed-door meetings before it was all brushed under the carpet.”

Another source said, “Some women did report it and were scared at the repercussions it would have on their careers. They complained, and nothing was done.”

It wasn’t just the behind-the-scenes brass who were aware of Lauer’s alleged misdeeds, either, sources said.

At least some of Lauer’s “Today” co-hosts were putting on a show when they acted gobsmacked on-air Wednesday morning at reports of his sexually inappropriate behavior, sources said.

“Matt’s sexual conquests were general office fodder,” a staffer said. “There was constant innuendo in the office about which woman had just had sex with Matt and which one would be next.”

Another female staffer said, “All the women on-air knew … Al Roker knew. They feared Matt.

“The last few years, as well as the many years before, Matt controlled all of the women on the show and had all the men bowing and scraping to him.”

A former “Today” staffer added, “For Matt, some women on the show were just a one-time thing, and he never spoke to them again. Other women he had affairs with. And others he just picked up and disposed of when he felt like it.

“The most horrible thing was that he made it clear that if they ever spoke out or crossed him, they would be fired from the show, negative stories leaked about them, and their careers would be destroyed,” the source said.

“So it is insulting to see the pretend shock on the faces of the people at ‘Today’ after Lauer was fired. This is just theatrics.”

The list of who knew about Lauer’s behavior before the scandal exploded Tuesday started at the top, sources said.

Previous NBC News chiefs Jeff Zucker and Steve Capus “got the complaints,’’ an NBC insider said.

Current NBC News President Noah Oppenheim and chairman Andy Lack “knew of the investigations into Matt’s behavior and tried to negotiate.”

Capus, who was president of NBC News from 2005 to 2013, and Jim Bell, the executive producer of “Today” until December 2012, were mostly concerned about keeping Lauer happy, according to sources.

So was the anchorman’s personal producer, Don Nash, who is now executive producer of the morning program, sources said.

“The show was a total boys’ club, even despite it having a very large female staff,” one source said.

Bell, who went on to produce NBC’s Olympics coverage, even “enabled” Lauer’s bad behavior, including his affairs with staffers and show contributors, another NBC executive alleged.

“There was a boys’ club mentality in the control room and in the hallways, and any complaints about that were dismissed,” the source said.

“It was always made out that these affairs were consensual, a joke about how many women had slept with Matt or had affairs with him. It was never suggested that the women were victims.”

Lauer was swiftly fired after an NBC employee came forward to company officials to accuse the longtime TV host of sexual harassment.

Within hours, two more women filed complaints with the media company, including one former employee who said Lauer sexually assaulted her in his office after locking the door.

Lauer allegedly had a button on his desk to remotely lock his office door, including one time when he is accused of having sex with a co-worker bent over his desk. He also allegedly flashed his penis to at least one colleague and invited co-workers to his hotel room at odd hours while traveling, accusers told Variety in a bombshell exposé Wednesday.

Nash said in a statement through NBC, “Never once has any woman or man complained to me about Matt Lauer. If they had, I would have gone straight to HR.’’

Bell did not respond to an email seeking comment.

Capus denied claims of having any prior knowledge of Lauer’s alleged behavior, as did Zucker, a former “Today” show producer who at one time was the president of NBCUniversal.

“There was never a suggestion of that kind of deviant, predatory behavior, not even a whisper of it,” Zucker, who is now president of CNN, said during the Business Insider IGNITION 2017 conference

Lack has strongly denied having received any complaints about Lauer’s behavior.

NBC officials have repeatedly claimed they never received complaints previously about Lauer — at least not the “current’’ management, including Oppenheim.

“We can say unequivocally, that, prior to Monday night, current NBC News management was never made aware of any complaints about Matt Lauer’s conduct,” the company said in a statement.

A “Today” source added, “There’s no way any of the current talent knew about anything that would be considered harassment, or worse.”

“Today” personalities Savannah Guthrie, Kathie Lee Gifford, Megyn Kelly, Hoda Kotb and Roker all responded to the news of Lauer’s behavior with on-air shock Wednesday.

Guthrie appeared shaken as she told the world that she was “heartbroken” for both Lauer and the “brave colleague who came forward to tell her story.”

Additional reporting by Danika Fears and Max Jaeger