Women living in Saudi Arabia will be allowed to vote, join the unelected Parliament and stand in local elections.
The Middle Eastern country is one of the last in the world to give women the right to vote.
Campaigners who've been fighting for women's rights for years say it's a massive step forward.
But women there still aren't allowed to drive, work, travel or have an operation without a man's permission.
It's all because the country follows a very strict version of Islamic law that's enforced by powerful religious leaders who advise the King.