Mia Honey Winslet Threapleton, born on October 12, 2000, in London, England, is an emerging English actress carving her own path in the entertainment industry.
As the daughter of Academy Award-winning actress Kate Winslet and painter-filmmaker Jim Threapleton, Mia was born into a world of creativity and talent.
Despite her high-profile parentage, she has worked diligently to establish her own identity, choosing to use her father’s surname to maintain some anonymity during auditions.
Raised between New York City and England, Mia grew up largely shielded from the spotlight, with her mother emphasizing a normal family life away from the chaos of fame.
Siblings
Mia is the only child from the marriage of Kate Winslet and Jim Threapleton, which lasted from 1998 to 2001.
However, she is part of a large, blended family with four half-siblings from her parents’ subsequent marriages.
From her mother’s side, Mia has two half-brothers: Joe Alfie Winslet Mendes, born in 2003 to Kate Winslet and her second husband, film director Sam Mendes, and Bear Blaze Winslet, born in 2013 to Winslet and her third husband, Edward Abel Smith.
Joe, who has also ventured into acting, appeared alongside Mia and their mother in the 2022 drama I Am Ruth, playing her character’s brother.
On her father’s side, Mia has two half-sisters, Olivia (born 2009) and Georgia (born 2013), from Jim Threapleton’s second marriage to Julie Vuorinen.
Career
Threapleton’s acting career began at the age of 13 with a non-speaking cameo as Helene in the 2014 period drama A Little Chaos, directed by Alan Rickman and starring her mother, Kate Winslet.
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By using her father’s surname, she avoided immediate association with her mother’s fame, allowing her to secure roles based on her talent alone.
In 2020, she took on the role of Alma in the Italian thriller Shadows, a performance that garnered attention for its depth and marked her first significant role.
In 2022, Mia starred as Rose in the American period drama series Dangerous Liaisons and joined her mother and half-brother Joe in I Am Ruth, a standalone episode of Channel 4’s anthology series I Am.
The episode, with its entirely improvised dialogue, showcased Mia’s ability to hold her own alongside her mother, earning critical acclaim.
In 2023, she appeared in the historical drama Firebrand and took on a main role as Honoria Marable in Apple TV+’s period drama series The Buccaneers, further solidifying her presence in the industry.
In 2024, she made a cameo in Netflix’s Scoop, playing a royal aide to Prince Andrew.
Her most notable role to date came in 2025, when she landed her first leading role in Wes Anderson’s black comedy The Phoenician Scheme.
Playing Sister Liesl, a nun estranged from her father (played by Benicio del Toro), Mia received rave reviews following the film’s premiere at the 2025 Cannes Film Festival.
Her audition process for the role, which began with a self-shot tape in May 2023, impressed Anderson and del Toro, who praised her ability to stand out among thousands of applicants.
Accolades
In 2025, Threapleton won the Breakout Artist Award at the Newport Beach Film Festival for her role in The Buccaneers, a testament to her growing impact in the industry.
That same year, her performance in The Phoenician Scheme earned her the Variety + Golden Globes Vanguard Award, highlighting her as a rising star following the film’s acclaimed premiere at Cannes.
Additionally, her work in I Am Ruth contributed to the project’s success, with the episode winning the Best Single Drama BAFTA in 2023, though the Best Actress BAFTA went to her mother, Kate Winslet.
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