Lucy Boynton emerged as a compelling screen presence, best known for her poignant portrayal of Mary Austin, the lifelong confidante and former fiancée of Freddie Mercury, in the blockbuster biographical film Bohemian Rhapsody. Born in New York City on January 17, 1994, to British parents—travel writer Graham Boynton and journalist Adriaane Pielou—she was raised in London from infancy. Her early exposure to the arts led her to the performing arts school Arts Educational Schools, London, setting the stage for a career that would deftly navigate between period dramas, independent horror, and mainstream success.

She made her professional acting debut at the age of twelve, playing the young Beatrix Potter opposite Renée Zellweger in Miss Potter. This early start was followed by a series of television roles that established her in British period pieces, including Ballet Shoes and a modern adaptation of Sense and Sensibility. She continued to build her resume with guest appearances on series like Lewis, Endeavour, and Law & Order: UK, showcasing her versatility. A significant early leading role came as writer Angelica Garnett in the BBC miniseries Life in Squares.

Boynton's career took a distinctive turn toward atmospheric and genre filmmaking in the mid-2010s. She delivered a chilling performance as a lonely boarding school student in the horror film The Blackcoat's Daughter and won hearts as the stylish and aspirational love interest in the charming Irish musical Sing Street. She further explored the horror genre with roles in I Am the Pretty Thing That Lives in the House and Don't Knock Twice. Her profile rose with a supporting role as Countess Andrenyi in Kenneth Branagh's star-studded Murder on the Orient Express. She simultaneously ventured into darker, complex television roles, playing a manipulative addict in the Netflix psychological thriller Gypsy and the daughter of a fanatical cult leader in the Netflix horror film Apostle.

The year 2018 proved to be a breakthrough when she was cast as Mary Austin in Bohemian Rhapsody. Her sensitive and grounded performance alongside Rami Malek's Oscar-winning turn brought her international recognition. Following this success, she embraced a series of high-profile projects, including playing the privileged and cunning antagonist Astrid Sloan in the first season of Ryan Murphy's Netflix series The Politician. She later starred in the HBO Max heist comedy Locked Down, appeared in an episode of Amazon's Modern Love, and took a leading role in the ITV Cold War spy drama The Ipcress File. Lucy Boynton continues to be a sought-after actress, recognized for her intelligent characterizations and ability to move seamlessly between film and television.