The jury of seven men and five women reached their verdict on Monday morning, the fifth day of deliberations.
Weinstein – who denied all charges – was convicted of sexually assaulting former production assistant Mimi Haleyi in 2006 and raping Jessica Mann, a former aspiring actress, in 2013. The judge ordered him to be sent to jail immediately.
But the jury acquitted him on two counts of predatory sexual assault, which carried a potential life sentence, and first-degree rape of Mann.
In the minutes after the verdict, Weinstein showed no emotion as he talked to his lead lawyer Donna Rotunno.
A third-degree rape charge in New York is defined as engaging in sexual intercourse with a person who is incapable of consent, or under age 17, or who has not given consent for a reason other than the inability to consent.
Prosecutors portrayed Weinstein as a serial predator who used his position of power in Hollywood to manipulate and attack women.
The defence team said sex between the movie executive and the accusers was consensual, and that the accusers used it to advance their careers.
The allegations amounted to “regret renamed as rape”, the defence said. Two of the accusers kept in contact with Weinstein and had sex with him after the alleged attacks, they pointed out.
The verdict was celebrated on social media on Monday by several women who had accused Weinstein of sexual assault and harassment, including the actress Ashley Judd. Ms. Judd was the first woman to go on the record about Weinstein’s misconduct for The Times’s 2017 investigation of the producer.
“For the women who testified in this case, and walked through traumatic hell, you did a public service to girls and women everywhere, thank you,” she wrote on Twitter.
“Harvey Weinstein is now a convicted rapist,” the Italian actress and director Asia Argento, another early accuser, wrote on Instagram under a picture she posted of herself with another woman. “Two survivors cry and celebrate. Thank you God.”
The actress Rosanna Arquette, another accuser, wrote on Twitter, “Gratitude to the brave women who’ve testified and to the jury for seeing through the dirty tactics of the defense.”
Ms. Judd, other key figures in the #MeToo movement and legal scholars also spoke to The Times moments after the verdict was read.