The 60-year-old actress has been a vocal advocate of issues concerning pay inequality and roles for women in Hollywood for several years.
In 2007, she launched the Geena Davis Institute on Gender in Media to help increase the female presence on-screen and reduce stereotypes surrounding women in the media, and last year she created the Bentonville Film Festival in Arkansas in a bid to highlight films featuring minorities and women, reported Variety.
She is now developing a documentary on the subject.
"I've been encouraged by my peers speaking out on gender disparity in recent years, but we still are not seeing the actual number change," Davis said.
Filmmaker Tom Donahue will direct the film, which will feature researchers from Davis' institute and her actor peers talking about the issue.
Last year, Davis praised the likes of Jennifer Lawrence, Jessica Chastain and Sienna Miller for making a stand for equal pay.