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Fionn O'Shea (born 2 January 1997) is an Irish actor. He starred in the films Handsome Devil (2016) and Dating Amber (2020). On television, he is known for his roles in the Channel 4 sitcom Hang Ups (2018), the BBC Three & Hulu miniseries Normal People (2020), and the Netflix miniseries House of Guinness (2025).
| Year | Title | Role | Notes |
| 2007 | New Boy | Seth Quinn | Short film |
| 2009 | A Shine of Rainbows | Orphan Boy | |
| 2016 | The Siege of Jadotville | William Reidy | |
| Handsome Devil | Ned Roche | ||
| 2019 | The Aftermath | Barker | |
| 2020 | Dating Amber | Eddie | |
| 2021 | Cherry | Arnold | |
| Wolf | Rufus/German Shepherd | ||
| 2023 | Dance First | Samuel Beckett | |
| 2024 | Lilies Not for Me | Owen James | |
| TBA | The Queen of Fashion | Philip Treacy | Post-production |
| Year | Title | Role | Notes |
| 2009–2012 | Roy | Jack | 24 episodes |
| 2010 | The Santa Incident | Hamley | Television film |
| Jack Taylor | Peter Gannon | Episode: The Priest | |
| 2013 | Jack Taylor: Priest | Peter Gannon | Television film |
| 2014 | The Centre | Corky Kavanagh | Episode |
| 2018 | Innocent | Jack | 4 episodes |
| Hang Ups | Ricky Pitt | 6 episodes | |
| 2020 | The Letter for the King | Tristan | Episode: "Storm Clouds Gather" |
| Normal People | Jamie | Recurring role; 5 episodes | |
| 2024 | Masters of the Air | Sgt. Steve Bosser | Apple TV+ Miniseries; 2 episodes |
| 2025 | House of Guinness | Benjamin Guinness |
| Year | Award | Category | Nominated work | Result | Ref. |
| 2017 | FilmOut San Diego | Best Actor in a Feature (Audience Awards) | Handsome Devil | Won | |
| 2018 | Irish Film & Television Awards | Actor in a leading role | Nominated | ||
| Rising Star Award | Nominated | ||||
| 2021 | Apolo Awards | Best Ensemble Cast | Dating Amber | Nominated | |
| Irish Film & Television Awards | Lead Actor in a Film | Nominated | |||
| Supporting Actor in a Drama | Normal People | Won |