The mother-of-one wasted no time in addressing President Donald Trump following his inauguration on Friday.
"I didn't vote for you but I want to be able to support you. But first I ask that you support me," she told the 70-year-old.
"Support my sister, support my mother, support my best friend and all of our girlfriends. Support the men and women here today that are anxiously awaiting to see how your next moves may drastically affect their lives," Johansson continued.
Scarlett Johansson spoke about Planned Parenthood following Donald Trump's inauguration on Friday
In an emotional speech, Scarlett opened up about her own experience with Planned Parenthood at 15
PROTESTS at Trump's Inauguration Day
Fri, January 20, 2017
Protestors were chased through the streets of Washington as violent scenes broke out close to the Donald Trump inauguration in Washington.
1 of 31
Police and demonstrators clash in downtown Washington after a limo was set on fire.
Speaking firmly and emotionally to the thousands of men and women who attended the event to march for gender and racial equality and against Trump's controversial beliefs about abortion and immigration, The Avengers star addressed the rights that the President's daughter, Ivanka Trump, had been "privileged" with.
"Support my daughter, who may actually, as a result of the appointments you have made, grow up in a country that is moving backwards not forwards, and who may potentially not have the right to make choices for her body and her future that your daughter Ivanka has been privileged to have," she said.
Johansson, 32, also opened up about her experience with Planned Parenthood, and spoke candidly about her relationship with the sexual health charity since the age of 15.
Scarlett at the Women's March on Washington with Cher and actor Fisher Stevens
Also attending the Women's March on Washington were actress America Ferrara and model Chrissy Teigen
Charlize Theron IN TEARS as she leads Women’s March against Trump
WATCH: Madonna admits she 'thought about BLOWING UP The White House'
"'Have you been to the gynaecologist yet?' That was the question my mum asked me at 15 when I informed her about a change that I had noticed in my body," she said.
"I'm not the type to divulge facts about my personal life, but I feel that in the face of this current political climate, it is vital that we all make it our mission to get really, really personal. So, yes, at 15, I had been to a gynaecologist."
She continued: "I was living in New York City and had visited a Planned Parenthood there. At 15 I had been working in the entertainment industry for eight or so years and had been fortunate enough to be eligible for private health insurance through my union.
"It was actually my clinician at Planned Parenthood who suggested I speak with my paediatrician if I was seeking a referral. She was compassionate and professional and told me she was happy to treat me for regular checkups, and when the time came, for STD and cancer screenings."
Hundreds of thousands of people descending on Washington to join the Women's March
Women and men marched with signs and placards at the peaceful event in Washington yesterday
The crowd cheered as the actress went on to say: "No judgement. No questions asked. Planned Parenthood provided a safe place where I could be treated with gentle guidance."
Trump's election has seen American pro-life groups predicting the restoration of a pro-life culture in the United States.
The 45th President has been vocal about his opposition to abortion and plans to defund Planned Parenthood.
Scarlett spoke emphatically about the fact that every one of her girlfriends had experiences with Planned Parenthood, and reflected on the lifeline that the charity had been to so many women.