Another billionaire has slapped his checkbook shut to Harvard University.

Businessman Len Blavatnik and his family foundation have paused their millions of dollars in funding to the Ivy League as it stands behind President Claudine Gay despite accusations she stood by as students spewed antisemitic rhetoric on campus, according to a report.

The Harvard Business School alumnus will halt his funding until the university directly addresses what he sees as rampant antisemitism at the school, a person with direct knowledge of the matter told Bloomberg.

Blavatnik and his wife Emily have donated at least $270 million to Harvard, with about $200 million directly benefiting the medical school.

What it will take for the elite institution to win back the Access Industries founder’s financial support is unclear. The Ukraine-born billionaire did not immediately respond to The Post’s request for comment.

Harvard University also did not respond to emails.

Blavatnik, who is Jewish, is the latest of a string of heavy donors to pause donations to Harvard following its alleged failure to condemn the mass slaughter of Israelis by Hamas terrorists.

Former Victoria’s Secret CEO Les Wexner, whose foundation had given untold millions to Harvard over 34 years, cut ties with the university shortly after the Israel-Hamas war started in October. Hedge funder Bill Ackman, also a business school alum, has repeatedly spoken out against the Ivy League, along with $500 million donor Ken Griffin.

The US government is also considering ways to strip billions of dollars in federal funding from the institution.

The backlash against the school has only ramped up following Gay’s disastrous testimony before Congress in which she said calls for genocide against Jewish people would only violate Harvard’s rules depending on their “context.”

Harvard has continued to stand behind Gay — who was also recently accused of 40 acts of plagiarizing other scholars’ work in a separate scandal — and has since apologized for her testimony.

The school is now being investigated by the federal Department of Education over whether it has breached the civil rights of Jewish students, which are protected under Title VI of the Civil Rights Act.

The millions of dollars in suspended gifts and federal funding would dramatically affect Harvard’s longstanding reputation, forcing the school to slash the level of donations that can secure admission.

One college counselor previously told The Post that a $2 million check might be the new $20 million.