Louisa Clare Harland (born ) is an Irish actress. She is known for her roles as Orla McCool in the Channel 4 sitcom Derry Girls (2018–2022), as Nell Jackson in the Disney+ series Renegade Nell (2024) and as Anna Welch in the RTÉ series The Walsh Sisters (2025).
In 2017, it was announced Harland had been cast as Orla McCool, the eccentric cousin of Erin Quinn (Saoirse-Monica Jackson), in the Channel 4 sitcom Derry Girls. The first series aired in January 2018, receiving critical and commercial acclaim, and the second in March 2019. A final third series, as well as a special, aired in 2022.
On 26 June 2020, Harland and her fellow Derry Girls costars performed a sketch with Saoirse Ronan for the RTÉ fundraising special RTÉ Does Comic Relief, with proceeds from the night going towards those affected by the COVID-19 pandemic. That same year, Harland appeared in the film Boys from County Hell.
Harland plays the lead role of Nell Jackson in the 2024 Disney+ series Renegade Nell.
| 2014 | Standby | Julie | |
| 2017 | Lost in London | Stella | |
| 2018 | Sunday Tide | Violet | Short film |
| 2020 | Boys from County Hell | Claire McCann | |
| 2022 | BabyDolls | Barbara | Short films |
| Noah | Kerry | ||
| 2024 | Joy | Rachel | |
| 2025 | Odd Socks | McBride (voice) | Short film |
| Hamnet | Rowan | ||
| 2026 | A Woman's Work | Jolene Harper | |
| Ramona | Short film. Post-production | ||
| Filming |
| 2011 | Love/Hate | Kayleigh | Series 2; 4 episodes |
| 2016 | Doctors | Caz Ellison | Episode: "Peanut" |
| Harley and the Davidsons | Secretary | Mini-series; episode: "Race to the Top" | |
| 2018 | Finding Joy | Tara | Episode: "Letting Go" |
| 2018–2022 | Derry Girls | Orla McCool | Main role. Series 1–3; 19 episodes |
| 2019 | Handy | Finnoula | Episode: "Pilot" |
| 2020 | The Deceived | Cloda O'Donnell | Mini-series; 3 episodes |
| 2023 | Big Boys | Midwife Kerry McFall | Episode: "The Night When" |
| 2024 | Renegade Nell | Nell Jackson | Lead role. 8 episodes |
| 2025 | The Walsh Sisters | Anna Walsh | Lead role. 6 episodes |
| 2021 | Whistle Through the Shamrocks | Mammy | Podcast; 6 episodes |
| 2018 | Cotton Fingers | Aoife | Aberaeron Memorial Hall, Aberaeron |
| 2019 | Glass. Kill. Bluebeard. Imp. | Niamh | Royal Court Theatre, London |
| 2023 | Dancing at Lughnasa | Agnes | Olivier Theatre, National Theatre, London |
| Ulster American | Ruth Davenport | Riverside Studios, London | |
| 2024 | Long Day's Journey Into Night | Cathleen | Wyndham's Theatre, London |
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