Beginnings (2004–2017) In 1997, at the age of 9, Coughlan had an uncredited role in the action thriller film ''
My Brother's War''. In 2004, she started her career with a role in
Tom Collins' short film
The Phantom Cnut, a revenge comedy. She suffered from depression during this period, and received help from her family. She worked part-time at an optician in Galway, and later responded to an open casting call for
Jess and Joe Forever at
The Old Vic in London and
The Orange Tree Theatre in Richmond, winning the main role of Jess. Her first performance was in September 2016, prior to a national tour.
Breakthrough (2018–2020) In 2018, Coughlan began playing Clare Devlin, one of the main characters in
Derry Girls, a sitcom set in
Derry,
Northern Ireland, in the 1990s during the final years of
The Troubles. Coughlan has said that her Northern Irish accent was inspired by
Girls Aloud's
Nadine Coyle.
Derry Girls is Channel 4's most successful comedy since
Father Ted, and the most watched show in Northern Ireland since modern records began in 2002. In July 2018, the cast appeared on challenge game show
The Crystal Maze. In December 2018, Coughlan competed against some of her
Derry Girls co-stars in an episode of
The Great British Bake Off. Though
Derry Girls was broadcast in January and February 2018 on
Channel 4, it was after its rerelease onto
Netflix in December that same year that the show gained international audience and popularity.
Derry Girls has received nominations at the
British Academy Television Awards, winning Best Scripted Comedy in 2023, and the
Irish Film and Television Awards, including winning Best Comedy in 2018. Coughlan played Hannah Dalton in
Harlots, a period drama television series set in 18th-century London. 2018 marked her
West End debut in
The Donmar Warehouse production of
The Prime of Miss Jean Brodie. In September, the
Evening Standard named her "one of the Rising Stars of 2018". Coughlan has stated that she auditioned for the part of
Robin Buckley in season 3 of
Stranger Things, but did not get the part. In 2020, she starred alongside Hannah Bristow in
audio play podcast series,
A Passion Play, about two teenagers' first love colliding with the
Crucifixion of Jesus.
Wider recognition (2021–present) In 2019, it was announced that Coughlan had been cast in the
Netflix series
Bridgerton, which premiered in December 2020. Coughlan played Penelope Featherington, a reluctant
debutante and youngest daughter of a
nouveau-riche family in
Regency era London. Coughlan's role was significantly cut back in the third series of
Derry Girls in 2022 due to scheduling conflicts with
Bridgerton and the
coronavirus pandemic. The third season of
Bridgerton focused on Coughlan's character's love story with
Luke Newton's Colin Bridgerton. For her lead role as Penelope Featherington in the third season of
Bridgerton, Coughlan received a
Screen Actors Guild Awards nomination for
Outstanding Performance by a Female Actor in a Drama Series, and a second nomination for
Outstanding Performance by an Ensemble in a Drama Series, having received a nomination for the first season of
Bridgerton. Coughlan also received an
IFTA Film & Drama Awards nomination for Lead Actress in a Drama. Coughlan was nominated for Best Actress in a Drama Series and Best Cast Ensemble in Streaming Drama Series at
The Astra Awards. Coughlan returned for the fourth season of
Bridgerton. In June and July 2021, Coughlan was nominated for Best Actress in a Supporting Role - Drama for
Bridgerton, and nominated and won Rising Star Award at the IFTA Film & Drama Awards. In November 2021,
The Hollywood Reporter included Coughlan in its Next Gen Talent 2021: The Hollywood Reporter's Rising Young Stars. In 2021, along with
Big Mood creator and writer Camilla Whitehill, Coughlan co-created, co-wrote and starred in
Whistle Through the Shamrocks, a six-episode scripted comedy podcast. Coughlan presented ''History's Youngest Heroes'', a twelve-episode history podcast focusing on the stories of twelve extraordinary people from across history, on
BBC Radio 4. In November 2022, Coughlan was honoured with Glamour's Women of the Year TV Actor Awards. In February 2023, Coughlan was awarded Best Newcomer at the Newport Beach Film Festival UK Honours. In July 2023, Coughlan made a brief appearance in
Barbie as Diplomat Barbie, later citing scheduling conflicts for the short time she was in the film. In the same year, she voiced the Playroom Fairy in
Apple TV+ Christmas special
The Velveteen Rabbit, based on the children's book of the same name. Coughlan also portrayed
Queen Victoria in the 2023
Dodger Christmas special on
BBC One and
CBBC. In March 2024, Coughlan portrayed the leading role of Maggie, a sufferer of
bipolar disorder, co-starring alongside
Lydia West in Channel 4 sitcom
Big Mood, a six-part
dramedy series about two best friends navigating friendship amidst a mental health crisis.
Big Mood was Channel 4's most-watched new comedy launch since
Derry Girls, and Coughlan received praise for her role as Maggie Donovan. Coughlan received her first British Academy Television Awards nomination for
Best Female Performance in a Comedy. She also won Best Comedy Performance at the
TV Choice Awards 2025. A second season of
Big Mood was confirmed in February 2025. In December 2024, Coughlan played the title role in the 2024
Doctor Who Christmas special, "
Joy to the World", written by
Steven Moffat, alongside
Barbie co-star
Ncuti Gatwa as the
Fifteenth Doctor. In October 2024, Coughlan was named in
Time 100 Next's 2024. She was also named in
Varietys 2024 Power Women of Hollywood. Coughlan was the cover of
Times 28 October 2024 issue, having been named as one of Time's Next Generation Leaders.
Vanity Fair and
TV Insider praised her performance as Penelope Featherington in
Bridgerton and Maggie Donovan in
Big Mood as one of the 24 best performances of 2024. She was
IMDb's second Most Popular Breakout Star of 2024, and seventh Most Popular Star of 2024. She was named as one of the best-dressed women of 2024 by ''
Harper's Bazaar UK''. Coughlan was named in
Elles "40 for 40: The Women In Film And Television Power List," which lists women that "will shape what - and how - you watch for decades to come".
The Independent named Coughlan in its "Independent Women 2025 - The Influence List" which listed 50 of the most influential women in the UK. Coughlan was honoured with the Konbini Commitment Award, which recognizes a talent or a series that has distinguished itself by the artistic quality and the societal, innovative or revolutionary dimension of its work, at the 8th
Cannes International Series Festival (Canneseries). In May 2025, Coughlan was named 36th in
Radio Times' TV 100 of the most influential people in TV. In June 2025, Coughlan was included on Pride Power List 2025 as one of the “Celebrity Allies Using Their Platform to Stand Up For Our Community When It Counts." Coughlan was also shortlisted for the Celebrity of the Year Award at the
National Diversity Awards 2025. Coughlan played the role of Silky in the upcoming adaptation of
Enid Blyton's
The Magic Faraway Tree. She will have a starring role in the upcoming feature drama-thriller,
Love and War, about a woman who must travel to
Syria to find her abducted daughter. Coughlan made her
National Theatre debut playing Margaret (Pegeen) Flaherty in
John Millington Synge's
The Playboy of the Western World in the
Lyttelton from 4 December 2025 to 28 February 2026. Coughlan had a voice role in
Sony Pictures Animation's
Goat, which had its theatrical release on February 13, 2026. Coughlan is set to lead the fourth season of Channel 4’s BAFTA-winning
I Am anthology series. Coughlan has narrated several
audiobooks, including
Sense and Sensibility by
Jane Austen,
Big Girl, Small Town (abridged) by
Michelle Gallen,
The Temple House Vanishing by Rachel Donohue,
Listening Still by
Anne Griffin, ''Aren't We Lucky
by Sarah Forbes Stewart, and an Audible Original, Misdirected
by Lucy Parker, alongside Gwilym Lee. In November 2022, she appeared in a Sam Mendes produced Audible audio adaptation of Oliver Twist''. Coughlan has narrated
Juno Dawson's ''Her Majesty's Royal Coven
, The Shadow Cabinet
, Queen B,
and Human Rites
. She narrated two chapters of Meet the Georgians: Epic Tales from Britain's Wildest Century
by Robert Peal ("Anne Bonny and Mary Read, pirate queens of the Caribbean" and "Ladies of Llangollen, the lovers who built paradise in a Welsh valley") alongside Bridgerton
co-star Adjoa Andoh, and she appeared in a cameo role as Countess Christiana in That Friend'' by
Sabrina Brier. == Other ventures ==