In 2010, Blyth began his on-screen career with small supporting roles in the films
Robin Hood and
Pelican Blood. In the years after graduating from college, he appeared in the short films
Fibs (2014),
Fluffy (2015), and
Wash Club (2016), all while working odd-jobs in Nottingham. In 2018, Blyth had his first lead role as Sid Sadowskyj opposite Richard Mason in the autobiographical coming-of-age film
Scott and Sid. That same year he appeared in Hazey Eyes' music video,
Scars ft.
Yoke Lore, as well as in the TV short
Rise. Upon graduating from Juilliard in 2020, Blyth was cast as
Glen Byam Shaw in
Terence Davies' biographical drama film
Benediction, which premiered the following year. In 2022, Blyth began starring as the titular
William Bonney in the
MGM+ series
Billy the Kid. For the role, Blyth learned how to ride, shoot, and talk like a "proper cowboy" with an Irish-American accent. That same year, Blyth made a guest appearance in an episode of the
HBO series
The Gilded Age. In 2022, Blyth was announced as the lead in
Bull Run based on
Bill Keenan's bestselling memoir
Discussion Materials. In 2023, he starred as a young
Coriolanus Snow opposite
Rachel Zegler in
The Hunger Games: The Ballad of Songbirds & Snakes, an adaptation of
The Hunger Games prequel of the same name. Blyth has an upcoming role in the adaptation of
Ernest Hemingway's novel
A Farewell to Arms. In March 2024, it was announced that Blyth, along with
Russell Tovey, would star in
Plainclothes, an independent film from writer-director Carmen Emmi. The film, which is based on true events, centres around an undercover cop in the 1990s who works to entrap and apprehend gay men until he finds himself drawn to one of his targets. In 2026, Blyth starred alongside
Emily Bader in the
Netflix romance film
People We Meet on Vacation, based on the
novel of the same name by
Emily Henry. On January 21, 2025, it was announced that Blyth would star in
Claire Denis'
The Fence. The film is based on
Bernard-Marie Koltes' play
Black Battles With Dogs. Blyth appeared on September 18, 2025, in
Paris Paloma's music video for Good Boy alongside the musician, playing the role of the titular male character. He is meant to represent "the everyday men who uphold power systems, who tread on women in their day-to-day life, and comment misogynistic things over the internet, thinking that it's really rebellious and subversive, when in actual fact they're just upholding the status quo". ==Filmography==