The anime adaptation of Toaru Kagaku no Railgun has just been confirmed for a third season! It will premiere in January 2020 , and will be animated by JCStaff studio and directed by Tatsuyuki Nagai. The opening and ending themes will be performed by fripSide and Kishida Kyoudan & The Akeboshi Rockets, respectively.
In addition, a visual announcement poster for the anime was also released:
Via: Moetron