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) and the BBC Three & Hulu miniseries Normal People (2020).

O'Shea attended Gonzaga College in Ranelagh,^[1] Dublin. He went on to train at Visions Drama School.^[2]

In 2007, O'Shea made his film debut in the Irish short film New Boy; it received an Academy Award nomination for Best Live Action Short Film. In 2009, he made his feature film debut, playing an orphan boy in A Shine of Rainbows. Between 2009 and 2012 he appeared on Roy, an Irish-British animated children's television series. In 2016, he portrayed Ned Roche in the Irish comedy-drama film Handsome Devil. At the 15th Irish Film & Television Awards in 2018 he was nominated for Actor in a leading role and Rising Star Award. In 2018 he featured on Hang Ups, a British television sitcom. Also in 2018 he appeared in Innocent, a British television miniseries. In 2019, he played a supporting role in the drama film The Aftermath. In 2020, he played Eddie in Dating Amber, and Jamie in Normal People.