At the campaign's inception, the "Harry Potter" actress made a moving speech about the need to treat men and women equally.
"To date, I've seen my father's role as a parent being valued less by society despite my needing his presence, as a child, as much as my mother's," she said in a speech at the United Nations. "I've seen young men suffering from mental illness, unable to ask for help, for fear it would make them less of a man."
"I want men to take up this mantle so their daughters, sisters and mothers can be free from prejudice but also so their sons have permission to be vulnerable and human, too and in doing so, be a more true and complete version of themselves," she said.
See the celebs who have taken to social media to show their support for Watson's call for action, especially some our favorite male stars.
Celebs Support #HeForShe
Celebrities join Emma Watson in #HeForShe movement
I'm supporting @UN_Women and @EmWatson in #HeForShe
As should you.. http://t.co/RYtM4SKkqN
So proud of @EmWatson. From the girl I grew up with to the inspirational woman she is today. I'm with you. #heforshe http://t.co/0j316BBznB
#HeForShe is a great cause to get behind! Please check it out. So proud of @EmWatson! http://t.co/lJrUWcmPEo
.@EmWatson you are impeccable & extraordinary. I stand with you. I believe in gender equality. #heforshe http://t.co/xXQsyJ7WfP
I am a passionate supporter of gender equality. @EmWatson @HeForShe @UN_Women http://t.co/IpudHsNpu3
And speaking of #Feminism, @EmWatson is doing a great project called #HeForShe. Go check it out http://t.co/vSrNTdFY3Q
I consider myself a Feminist & I wanna know what #Feminism means to you. Watch+Contribute: http://t.co/IuNphYG8Nq http://t.co/fLWkz81eMy
Guys, @EmWatson really got it right. Gender equality isn't about taking a side, it's about human dignity for all. It's evolution #HeForShe
Emma Watson to men: Gender equality is your issue too http://t.co/lC8Y2C92CI Couldn't agree more. Real men support gender equality #HeForShe
My friend @EmWatson delivered a powerful speech to the UN http://t.co/yWtW3mjqBh I support equality. #HeForShe http://t.co/gCNTK1BNvx
As a man, I accept @EmWatson invitation 100 times over to join gender equality. Her speech... wow. #HeForShe
As a feminist and a human being, I agree with @emwatson (read her speech) @UN_women #heforshe (pic by @amandapalmer) http://t.co/prm1O2LRUg
Brilliantly said @EmWatson #Freedom #HeForShe http://t.co/TtNBRHLhGm
I'm committed to #genderequality. I invite you to stand with me. @HeForShe http://t.co/HUC3Q6qZBb @EmWatson http://t.co/VukH9a51No
Husband to a wife, father to a daughter, son to a mother. You bet I'm on board, @EmWatson! #heforshe http://t.co/5SyIKIbCZo
Get up, stand up and lift up! Join me please at http://t.co/Wcg8EVlr0M @heforshe @GirlUp @UN_Women #HeForShe http://t.co/aRkFWFI2zq
Stand up for your women. Stand up for your men. Stand up for equality. #heforshe http://t.co/r2oY4sR6Kv
Proud to support the #HeForShe campaign of @UN_Women http://t.co/BVMoJ4oJph
I am #HeForShe. Inviting all men to stand up for gender equality. @HeforShe