Boyega, 23, will play an Internet company's employee, who strikes a friendship with a newbie played by Watson, reported Aceshowbiz.
Adapted from Dave Eggers' 2013 book of the same name, "The
Circle" follows a woman who lands a job at a powerful tech company called the Circle, where she becomes involved with a mysterious man.
Watson, 25, will play the central character while Hanks steps in the role of the charismatic man.
"Next up! 'The circle' with Tom hanks, Emma Watson and James Ponsoldt directing. I'm excited about this untold story," Boyega tweeted about his casting.
Filming will begin next month in California but premiere date is unknown.
Boyega's film "The Force Awakens" hits theaters on December 18.