"I found out about Harvey about a year ago and I'm ashamed that I didn't say anything right then", Fonda, 79, told Christiane Amanpour during an interview for CNNMoney on Thursday.
The Oscar award winning actress said that she was never assaulted by the movie mogul.
Fonda admitted she had first heard about the allegations a year ago, but did not publicly speak out to protect his accusers' privacy.
"It's very hard to come forward when you've been a victim of sexual abuse because you get dragged over the coals, you have to prove, you have to justify".
"I'm hoping that with this coming out about Harvey Weinstein, Bill Cosby, and then (the man) who's now our president, that men will not feel they can get away with it", she said. "But it's important that it come out", Fonda said of the many women who came forward for these articles, with allegations the Hollywood mega-producer sexually harassed and/or assaulted them over decades.
Fonda, an Academy Award victor, spoke to Amanpour about her own past experiences with sexual harassment and abuse.
"I only met Harvey when I was old and Harvey goes for young, because that's more vulnerable".
When asked by Amanpour why she didn't speak out about the controversy sooner, Jane defended that as "it hadn't happened to [her]" she didn't "feel it was [her] place" to say anything. "You realize what I'm feeling is ok because this person is sharing my pain", she said.
However, she cautions against any belief that this issue is unique to Hollywood.
Fonda told Amanpour that Weinstein's pattern of abuse is not an isolated phenomenon.
Fonda said the director had propositioned her ahead of a role, claiming: "he had to find out what kind of orgasms she had".
"Let's not think that this is some unique horrific.this goes on all the time". "This goes on all the time, this male entitlement in Hollywood and everywhere - in offices and businesses all over the world, in bars, in restaurants, in stores women are assaulted, abused, harassed", she said.
"You can do anything", he boasted.
"I'm so proud of those fellow actors that are speaking up and I know that it has taken a long time".
"We have to stand up to them", Fonda added.