Rosie Jane Day is an English actress, director and writer. She is known for her roles as Mary Hawkins in the Starz series Outlander and Sarah Jessica Parker's daughter in the comedy film All Roads Lead to Rome. She starred as Tina Pemberton in Sky One's Living the Dream and Sierra in the 2018 Summit Entertainment feature Down a Dark Hall.
Day is an ambassador for the teenage mental health charity stem4. Her novel Instructions for a Teenage Armageddon, based on her one-woman play, was published in 2021.
Day has been acting since childhood, both on stage and on screen, following in the footsteps of her older sister. It was at one of her sister's auditions that she was spotted by a casting agent and given her first role, at the age of 4, in BBC's Hope and Glory. In that same year, Day and her sister played two of the Dudakov children in Maxim Gorky's play Summerfolk at the Royal National Theatre in London. She soon became a successful child actor on British television playing roles such as young Tess Elliot in ITV's medical drama Harley Street in 2008, and in theatre including at the Royal Court Theatre and Palace Theatre.

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