Wallis Day (born 20 September 1994) is an English actress and former model. She is known for playing Holly Cunningham in the soap opera Hollyoaks, Nyssa-Vex in the TV series Krypton, and Kate Kane in the second season of the TV series Batwoman.
In March 2021, Day was cast to recur in the second season of the CW series Batwoman to take over the role of Kate Kane from Ruby Rose. She debuted in the episode “Initiate Self-Destruct”, where the character’s facial change is explained. Day also portrayed Circe Sionis.