The US actor was convicted in May of drugging and then raping fellow members of the Church of Scientology between 2001 and 2003 at his home in the swanky Hollywood Hills area of Los Angeles.
It was the second rape trial for Masterson, 47, after previous proceedings were declared a mistrial in November when a different jury was unable to reach a unanimous decision.
The jury in the retrial deadlocked on another rape charge against a third woman. That charge was dismissed.
Masterson has been in custody awaiting sentencing since his conviction.
The actor rose to fame with the 1998 launch of retro sitcom "That '70s Show," where he played the character of Steven Hyde alongside fellow stars Mila Kunis and Ashton Kutcher.
He co-starred again with Kutcher on Netflix's "The Ranch," but was fired in 2017 and written off the show after Los Angeles police confirmed they were investigating multiple rape allegations against the actor.
The three women at the heart of the charges against Masterson were members of the Church of Scientology at the time. Two of them said church officials had discouraged them from contacting law enforcement.
Masterson's lawyers in closing arguments questioned why the court had heard "so much about Scientology," and the defense had suggested that bias against the church could have been a motivating factor.
The Church of Scientology criticized the notion that it had tried to silence the complaints.
"The church has no policy prohibiting or discouraging members from reporting criminal conduct of anyone, Scientologists or not, to law enforcement," a statement said.
"Quite the opposite, church policy explicitly demands Scientologists abide by all laws of the land."
