GOP officials have nominated the daughter of Nassau County Republican Party chairman Joseph Cairo to become a state supreme court judge — with backing from the rival Democratic Party, sources close to the selection process said Wednesday.

The bipartisan deal guarantees that Lisa Cairo, currently a family court judge, will be elected to the state Supreme Court without a challenge.

“Cairo is making his daughter a Supreme Court judge. How does it look? It’s nepotism 101,” sniped one source close to the Nassau Republican Party.

Democrat and Republican leaders have entered into a bipartisan pact to evenly parcel out judgeships and avoid having to spend enormous sums on judicial races. The party bosses would rather raise funds and devote resources on countywide and legislative races, sources said.

While good for the lucky few who are nominated, the bipartisan selection process limits competition from others seeking to serve on the bench.

The revelation comes a day after a video emerged of ex-Brooklyn Democratic boss Frank Seddio threatening to “rip the f—king heart” out of a party activist for disagreeing with him over judgeships.

Joseph Cairo, a lawyer who also is president of the Nassau County Off Track Betting Corporation, declined comment.

But Nassau County GOP spokesman Mike Deery defended Lisa Cairo’s selection.

“The delegates to the 10th Judicial District have unanimously nominated the highly
respected Family Court Judge, Lisa A. Cairo, for the Supreme Court,” Deery said.

The statement noted that Lisa Cairo was deemed “well qualified” by the judiciary screening committee of the Nassau County Bar Association.

Lisa Cairo is past  President of the Nassau County Women’s Bar Association.

“The Nassau County Republican Committee is pleased when women of distinction and talent are elevated to positions of trust and responsibility. Accordingly, we congratulate Lisa A. Cairo on her nomination to the Supreme Court,” Deery said.

Nassau County Democratic chairman Jay Jacobs confirmed the bipartisan nomination of Lisa Cairo to the bench.

“Her name will raise people’s attention,” Jacobs admitted.

But Jacobs, who also serves as the state Democratic Party chairman, defended Lisa Cairo’s nomination, saying “she’s certainly qualified to do the job.”

“Lisa Cairo is respected across the board — her father’s position notwithstanding,” he said.

Lisa Cairo used to be a law partner with Steve Schlesinger, former legal counsel to the Nassau County Democratic Party. He also praised her qualifications and work ethic.

“If she was not Joe Cairo’s daughter people would say Lisa is a great choice for the bench. The only black mark is that she happens to be Joe Cairo’s daughter,” said Schlesinger.

Retired Appellate Court Judge David Saxe said he’s OK with cross-party endorsements for judgeships, as long as there is a rigorous screening process.

“I see nothing wrong with cross-endorsements as long as the judges are screened by a committee comprised of diverse community interests. Judicial elections between party candidates turns judges into politicians — not a desirable outcome,” said Saxe, now a partner at the law firm Morrison Cohen.