A masked University of California, Santa Barbara, staffer allegedly helped turn a mob of anti-Israel protesters against a Jewish student leader, with the school accused of repeatedly ignoring her pleas for help, according to a new lawsuit filed Thursday.

Tessa Veksler, 23, a Manhattan resident who double-majored in political science and communications, claimed she was subjected to a vicious, months-long antisemitic campaign after she condemned the Oct. 7, 2023, Hamas terrorist attack that killed more than 1,200 people in Israel, according to the complaint filed in California federal court.

The hateful campaign reached a boiling point in February 2024 when Veksler, the student body president, confronted a crowd of masked anti-Israel protesters to try to reach an understanding with them, the suit said.

“And she believed she was making progress until a UCSB representative — defendant Doe 1, and also wearing a mask — joined the meeting and began harassing Tessa and purposefully inciting the crowd’s antisemitic animus toward Tessa,” the lawsuit said.

The staffer interrupted Veksler during her talk and goaded the crowd to be aggressive toward the student president, the suit claimed.

The incident was just one of the many forms of antisemitism Veksler claims she faced during the 2023-24 school year, with school officials allegedly doing little to nothing to help her amid the constant harassment.

UCSB officials did not immediately respond to The Post’s request for comment.

Veksler, a first-generation American, said the harassment began after she spoke out against Hamas’ attack on Israel, which also saw 251 people kidnapped and served as the catalyst for the war in Gaza.

When she posted her condemnation of the terror attack on social media, Veksler found herself accused of “supporting genocide,” with posters littered around campus calling her a “Zionist” and demanding she resign as student body president, according to the lawsuit.

The harassment campaign was centered around the school’s Multicultural Center (MCC), which was on the way to Veksler’s office, effectively keeping her away from a space where she and other Jewish students were meant to be safe.

Some of the signs read, “AS president is racist Zionist” and “Get these Zionists out of office.” One of the posters held an ominous message: “You can run but you can’t hide Tessa Veksler.” Veksler’s phone number was also included in one of the posters. Students also referred to her as a “Zionist dog,” according to the suit.

UCSB’s official MCC Instagram account even featured a post with one of the posters, the complaint said.

“All of these threats and this harassment took place under the watchful eye of the University and its administrators. But the UCSB did nothing, despite its elaborate anti-discrimination Policy and Tessa’s repeated pleas for help,” the lawsuit said.

“The university, in short, abandoned Tessa to the antisemitic mob, discarded its own written Policy intended to prevent that harassment, and allowed and facilitated an insidious injustice to continue unabated,” the suit added.

The school eventually put out a statement on Feb. 26, 2024, condemning attacks on students over the volatile situation in the Middle East, but it did not directly name Veksler.

Veksler, who has gone on to become a vocal advocate against antisemitism, suffered panic attacks and post-traumatic stress disorder due to the harassment, the lawsuit states, with the former student body president avoiding campus during her final exams.

Veksler is ultimately seeking unspecified damages against UCSB and 20 staffers and representatives for allegedly violating her civil rights after failing to secure her freedom of speech and safety on campus.