A Golden Globe nominee, Rosie Day is an English film and theater actress who is best noted for playing the roles of Mary Hawkins in the TV series, Outlander and Sarah Jessica Parker's daughter in the comedy road film, All Roads Lead to Rome. Day, who made her professional acting with Hope and Glory in 1999, over the years, in her illustrious career has starred in more than 25 films. Some of her most notable acting credits include Family Affairs (2002), My Life as a Popat (2007), Half Moon Investigations (2009), Holby City (2011), Howl (2016), Outlander (2016) and Watership Down (2017).

Apart from her elaborate career in TV and films, Day has also worked as a theater artist. Having made her debut on the stage with Summerfolk, a Royal National Theatre production, Day starred in other plays like Les Miserables (2006), Pussy Riot (2012) and Velocity (2014).