Amelia Eve "Millie" Gibson is an English actress.

Gibson made her acting debut as Indira Cave in the CBBC television series Jamie Johnson in 2017. She went on to appear in the second and third series, appearing in a total of 17 episodes. In November 2017, she appeared as Mia in the third episode of the BBC One drama series Love, Lies and Records. In October 2018, she appeared in the three-part ITV drama series Butterfly as Lily Duffy.

In June 2019, Gibson joined the cast of the ITV soap opera Coronation Street as Kelly Neelan. She originally appeared in five episodes before returning as a regular character in April 2020. For her portrayal of Kelly, she won the award for Best Young Actor at the 2022 British Soap Awards. She was also nominated for Best Actress at the Inside Soap Awards later that year.

In November 2022, it was announced during the BBC's annual Children in Need telethon that Gibson would join the cast of Doctor Who in 2023 as Ruby Sunday, the companion of the Fifteenth Doctor, portrayed by Ncuti Gatwa.