Opera legend Placido Domingo is being accused of serial sexual harassment spanning three decades, alleged abuse that one victim called a “well-known secret” in the music world.

Eight singers and a dancer told the Associated Press that they were sexually harassed by the married 78-year-old tenor — with two saying they eventually gave in to his advances.

One accuser claims he left her $10 after one of the two times they had sex.

“I don’t want you to feel like a prostitute, but I also don’t want you to have to pay to park,” she claims he told her.

One of the women said the multiple Grammy Award winner stuck his hand down her skirt and three others said he forced wet kisses on their lips — in a dressing room, a hotel room and at a lunch meeting.

“He was always touching you in some way, and always kissing you,” one of the women told the outlet.

Another said, “I felt like prey. I felt like I was being hunted by him.”

Seven of the nine believe their careers were harmed after they spurned his advances, with none getting to work with him again, they said.

Six other women also allege that Domingo, who has been married since 1962, made them feel uncomfortable with his sexual propositions.

Mezzo-soprano Patricia Wulf, now 61 and the only accuser willing to be identified, says the star never touched her but his constant pressing for sex “absolutely and most certainly … was sexual harassment.”

Calling it a “well-known secret” in the opera world, she said, “I’m stepping forward because I hope that it can help other women come forward, or be strong enough to say no.”

Dozens more in the opera business also told the AP that they witnessed Domingo being sexually inappropriate toward younger women, dating back to the 1980s.

“The allegations from these unnamed individuals dating back as many as 30 years are deeply troubling, and as presented, inaccurate,” Domingo told the news agency.

“Still, it is painful to hear that I may have upset anyone or made them feel uncomfortable — no matter how long ago and despite my best intentions.

“I believed that all of my interactions and relationships were always welcomed and consensual.”

He said he would never “intentionally harm, offend, or embarrass anyone.”

“However, I recognize that the rules and standards by which we are — and should be — measured against today are very different than they were in the past,” he said, insisting he will “hold myself to the highest standards.”

With Post wires