Hope Exiner d’Amore said Harvey Weinstein raped her in a hotel room in the 1970s, when he was a young concert promoter in Buffalo. Cynthia Burr said that during this time, he assaulted her in an encounter that began in an elevator and ended with forced oral sex in a hallway. Ashley Matthau, a dancer with a bit part in one of his movies, said that in 2004, he pushed her down on a bed and masturbated while straddling her. Days later, she said, he paid her to remain silent.

Three weeks after complaints of sexual harassment and misconduct by Mr. Weinstein were first reported in The New York Times, women from different continents, fields and generations have come forward with allegations of rape, sexual assault and groping. New accounts include one previously undisclosed settlement with Mr. Weinstein and expand the time frame of alleged wrongdoing to the 1970s.

Together, the accounts provide a widening tally of alleged abuses, and illustrate the toll on women who say they felt ashamed and isolated as they watched the Hollywood producer walk red carpets, pile up Oscars and showcase his ties to prominent figures.

“This has haunted me my entire life,” said Ms. Exiner d’Amore, now 62, who was in her early 20s at the time of the alleged rape.