The Sherlock Holmes: A Game of Shadows actress attended an Occupy protest last year in Toronto, where she says she was encouraged by the friendly discussions of important political and social issues.
"I wanted to educate myself," McAdams told Glamour. "People have said it's unfocused, but I appreciate that there are so many different groups coming together peacefully, saying there are things that are broken in the system, and we need to put our heads together."
The Occupy movement has garnered the support of many celebrities, including Roseanne Barr, Susan Sarandon and Mark Ruffalo.
Hip-hop mogul Russell Simmons vowed to go to jail with demonstrators in New York City in October amid rumours that police were planning to break up the protests.
Gossip Girl's Penn Badgley has been a frequent visitor to the Occupy Wall Street gatherings, while filmmaker Michael Moore has credited the protestors with inspiring real political change.
McAdams stars opposite Channing Tatum in the romantic drama The Vow, which is released on February 10 in the US and the UK.
> Martin Sheen: 'Occupy movement represents hope and despair'
> Law & Order: Special Victims Unit filming halted by Occupy protest
Watch Rachel McAdams in a trailer for The Vow below: