Ariel Helwani first reported the news, and it was later confirmed on Wednesday's episode of UFC Tonight.
Tate (18-5) defeated Holly Holm March 5 at UFC 196 via fifth-round rear-naked choke, extending her winning streak to five.
Nunes (12-4), meanwhile, has won three straight since losing to Cat Zingano at UFC 178 in September 2014. Most recently, "The Lioness" defeated Valentina Shevchenko via unanimous decision at UFC 196. Of Nunes' 12 career victories, nine have come via TKO.
Tate vs. Nunes joins a UFC 200 card headlined by a rematch between Nate Diaz and Conor McGregor.