Wallis Day est née le 20 septembre 1994 à Londres, Angleterre, Royaume-Uni. Elle est actrice et scénariste. Elle est connue pour Sex/Life (2021), Batwoman (2019) et Infinite (2021).
Day was trained up to swim for GB in the 2012 Olympics, but stopped swimming competitively when acting became more prominent in her life. However she has since trained in martial arts and performs all her own stunts on set.
