Jeffrey Epstein’s pilots were slapped with federal grand jury subpoenas after refusing to cooperate with authorities, The Post has learned.

The feds want to know who was on board Epstein’s plane during certain flights, but the pilots “lawyered up” and wouldn’t answer questions when they were contacted, law-enforcement sources said Friday.

The pilots were served with the subpoenas earlier this month, following the multimillionaire financier’s July 6 arrest on conspiracy and child sex trafficking charges, according to the Wall Street Journal, which first reported on the subpoenas.

Revelation of the subpoenas came a day after a Manhattan federal court filing disclosed that prosecutors were conducting an “ongoing investigation of uncharged individuals” tied to the convicted pedophile.

The Journal didn’t identify the pilots who were subpoenaed but said a lawyer for one confirmed receipt.

Epstein, 66, was busted at Teterboro Airport in New Jersey following a private-plane flight from Paris.

Companies controlled by Epstein own “at least two private jets in active service, at least one of which is capable of intercontinental travel,” prosecutors wrote in a court filing earlier this month.

In response, Epstein’s lawyers said he sold one of the planes in June and was willing to ground the other if granted bail – a request that a judge denied last week.

One plane – a Boeing 727 nicknamed the “Lolita Express” – was customized to carry 29 passengers and was outfitted with a queen-sized bed, a red velvet sofa and chairs, and a shower, according to The Sun.

Epstein has employed four pilots and flight engineers – David Rodgers, Larry Visoski, Larry Morrison and Bill Hammond – according to the Journal, which cited information from civil lawsuits filed against Epstein by alleged sex abuse victims.

None of the four responded to requests for comment from The Post.

Visoski formerly maintained an Instagram account that he used to document his travels, but he deleted it last week, according to the Washington Examiner.

Visoski, who used the handle “Capt Big Dawg,” posted photos from across the country and the US Virgin Islands, where Epstein owns a private island called “Little St. John,” as well as the Caribbean, Europe, Mexico and the Middle East, the Examiner said.

Epstein didn’t appear or get mentioned in any of the posts, but there were photos of his planes and helicopters, the Examiner said.

He’s being held at the infamous Metropolitan Correctional Center in lower Manhattan, where officials on Tuesday found him nearly unconscious and with bruises on his neck, sources have said.

Cellmate Nicholas Tartaglione, a hulking ex-cop who faces the death penalty in four drug-related killings, denied any involvement, sources said.