Mia Honey Winslet Threapleton (born 12 October 2000) is an English actress. The daughter of actress Kate Winslet and painter-filmmaker Jim Threapleton, she made her film debut at the age of 13 with a non-speaking cameo in the period drama A Little Chaos (2014). On television, she co-starred with her mother in the episode "I Am Ruth" (2022) of the anthology series I Am..., and starred in the period drama series Dangerous Liaisons (2022) and The Buccaneers (2023). She had her first lead role in a feature film in the black comedy The Phoenician Scheme (2025).
2025The Phoenician Scheme as Sister Liesl
2025Two Places at Once as Danni
2024Firebrand as Joan
2024Scoop as Maid
2023The Buccaneers (16 Episodes) as Honoria Marable
2023Dropping as Nora
2023Shadows as Alma
2019The Kelly Clarkson Show (1 Episode) as Self
2019I Am... (1 Episode) as Freya
2015A Little Chaos as Helene