
Tara-Lynne O'Neill (born 16 November 1975) is a film, theatre and television actress from Northern Ireland.
During her childhood, she aspired to become a dentist, but abandoned this after failing her General Certificate of Secondary Education in chemistry.
At sixth-form college, she opted for a career in acting.
O'Neill started work as a television presenter on Saturday Disney from 1993 to 1996. She was also a main presenter on The Over the Wall Gang, a young people's television show from BBC Northern Ireland
O'Neill also appeared in film roles such as the town's seductress in The Most Fertile Man in Ireland (1999), and as Claire McKee in Wild About Harry (2000). She later played Joanne Ryan in EastEnders, appearing in 58 episodes between 20 September 2002, and 21 August 2003.
Between 2013 and 2016, she appeared in The Fall. In 2018, she joined the main cast of Derry Girls as Mary Quinn, remaining on the show until the airing of the final episode on 18 May 2022. In April 2024, O'Neill was cast as Inspector Eve Dunlop in BBC's Hope Street for the show's fourth series.
Her other roles include The Informant (1997), Disco Pigs (2001), Full Circle and Omagh (2004).

The Spin
Sadie
2024

Best Before
2024

The Last Rifleman
Tracy Milligan
2023

Malcolm
Dr Gallagher
2023

Just Johnny
Mrs. Wilson
2021

Derry Girls
Ma Mary Quinn · (19 episodes)
2018

Our Lives
Self - Narrator · (2 episodes)
2017

A Patch of Fog
Vera
2015

Insulin
The Pharmacist's Wife
2015

The Fall
Martina Dean · (3 episodes)
2013

Made in Belfast
Jane
2013

Line of Duty
Lorna · (1 episode)
2012

Line of Duty
Lorna Barrett · (1 episode)
2012

Celebrity Antiques Road Trip
Self - Participant · (1 episode)
2011

Omagh
Carol Radford
2005

The Roman Spring of Mrs. Stone
Angel Hunter
2003

Chaos
Marie
2002

Disco Pigs
Mags
2001

The Most Fertile Man in Ireland
Mary Mallory
2000

The Informant
RUC Policewoman
1997

Touched by an Angel
(1 episode)
1994