Crooked ex-Assembly Speaker Sheldon Silver kept two mistresses during his years in power, using his great influence to advance their careers in Albany, while cheating on wife Rosa and covering his tracks with a secret second cell phone, federal authorities revealed Friday.

While serving as speaker, Silver repeatedly three-timed his wife of 48 years, with the pair of middle-aged blondes who were heavily involved in Albany politics, throwing his considerable weight around to secure them clients and plumb state jobs, the documents reveal.

One of the women was confirmed through sources as influential lobbyist Patricia Lynch, 57. Lynch enjoyed “special access” to Silver, lobbying him directly on behalf of clients with business before the state, the feds allege in the documents, released Friday ahead of his May 3 corruption sentencing.

That relationship went back at least six years, according to Albany insiders, who said Silver’s dalliances were a widely rumored and sometimes sloppily-kept secret.

“Love was in the air,” one source told The Post of seeing Silver and Lynch “making out” in an elevator at the 2000 Democratic National Convention in Los Angeles.

“It makes me sick,” added the source, who is also a lobbyist. “This was the biggest kept secret in Albany. They were canoodling.”

Reached on her cellphone, Lynch — Silver’s former communications director, whose enviable lobbying client list included Madison Square Garden, Time Warner Entertainment, Tishman Speyer and Walt Disney — hung up on a reporter. A spokesman issued a terse, “No comment.”

The second woman is attorney and former beauty queen Janel Hyer-Spencer, 51, whose lawyer, Manuel Ortega, confirmed that she is one of the two name-redacted women in the papers — but denied the affair.

“There is absolutely no truth to the allegations of an affair. A friendship has been turned into a sexual relationship with no evidence whatsoever,” Ortega said in a statement.

​Silver, 72, also issued a denial. “These are simply unproven and salacious allegations that have no place in this case or public discussion,” his lawyers Steven Molo and Joel Cohen, said in a statement.​​

But the heavily-redacted documents detail arguments prosecutors in Silver’s $5 million corruption case had hoped to use if Silver tried to present evidence of good moral character at trial.

The fed documents say:

Lynch and Silver were caught on tape in an undated conversation worrying about whether the press would find out about their affair. The two strategized over an unnamed reporter who’d been calling around on a story about legislators having affairs. Silver was caught on tape saying, “I don’t think he caught us,” the feds say, but he worried about his travel and campaign records giving them away and said they shouldn’t be seen together for awhile.

Lynch also griped to Silver about a high-level member of his staff not treating her well, and huffed on tape about a pending lobbying matter, “I don’t talk to anybody about the issue except you.”

Silver and his lobbyist paramour remained close even after the affair, using “very affectionate names.”

He used his second cell phone just to contact Hyer-Spencer. The phone was not in Silver’s name, and no bills were sent to him. It was activated days after hers was activated.

Silver enjoyed a “long-running” relationship with Hyer-Spencer and, through his chief of staff, recommended her for a prime state position, the papers said.

Hyer-Spencer first came to Albany in 2007, as a Democratic Assemblywoman from Staten Island, but when she lost reelection in 2010, Silver allegedly used his sway with the Board of Regents to successfully keep her in Albany — as a $84,000-a-year congressional lobbyist for the Education Department.

“The Speaker’s office called after making the initial recommendation … to check in on the status of her application,” the feds said.

In 2013, Hyer-Spencer took a $99,600 job as a support magistrate in Staten Island Family Court. Silver’s childhood friend, former Chief Judge Jonathan Lippman, oversaw all state courts, and their appointments, at the time.

“The process in which she was hired is a merit process,” said courts spokesman Lucian Chalfan, denying Silver had a hand in the appointment.

Additional reporting by Kirstan Conley and Jamie Schram