Ruth Madoff is in the clear — for now.

Ruth will not be prosecuted for the massive Ponzi scheme that won her husband Bernard Madoff a 150-year prison sentence, sources told The Post yesterday.

Federal prosecutors decided not to criminally charge Ruth because they lack evidence that she was either aware of or involved in Bernard Madoff’s scam — which swindled thousands of people and charities out of billions of dollars, said two sources familiar with the case.

That decision comes after an intensive, six-month probe in which investigators scoured financial records and interviewed scores of people.

In the end, the feds found “no criminal exposure” for Ruth, a source said.

However, sources cautioned that authorities could change their minds if they discover new, incriminating evidence against the 68-year-old Upper East Side matron.

The decision to let Ruth off the hook — despite widespread suspicion by victims that she was in cahoots with Bernie — comes amid her agreement last week to sell her Manhattan penthouse apartment and millions of dollars worth of other assets, including yachts and houses in Palm Beach, Fla., Montauk, LI, and the French Riviera, so that victims can get some reimbursement.

Ruth will be left with just $2.5 million in cash by federal authorities under that deal.

“In the deal, she lost everything. She’s lost everything she holds dear,” said one source. “She’s lost her husband. She has no friends.”

“She’s persona non grata in Palm Beach, everywhere she cared about. She’s a beaten woman. There’s nothing left on the carcass to take,” the source said.

“They’ve squeezed her dry.”

Ruth’s lawyer, Peter Chavkin, declined to comment last night.

FBI spokesman James Margolin also declined to comment.

Lori Sirotkin, a Boca Raton, Fla., resident who lost her life savings to Madoff’s scam, said she was “very disappointed” to hear that Ruth would not be prosecuted.

“My gut feeling is she is not innocent,” said Sirotkin, 52. “After being married to him for so many years, and working in the company, I can’t believe that she was not involved or at least didn’t know.”

Another victim, Gregg Felsen of Minneapolis, said “I think she should be charged, and the [Madoff] sons, too.”

“I think it was a family affair,” said Felsen, a 62-year-old photographer who considered suicide and underwent therapy after losing his life savings in the scheme. “How could you perpetrate a scam like that for 30 or 25 years without your family knowing about it? It’s kind of hard to believe.”