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Sinéad is an award-winning Irish actress, presenter, producer, and founder of ORion Productions. She holds an Honours Degree in Electronic Engineering, an Associate Recital Diploma from LAMDA, and a Postgraduate Diploma in Advanced Producing with Screen Ireland. In 2024 she made a powerful mark with her first leading role in the Irish independent feature film Swing Bout, where she played a conniving, morally ambiguous boxing coach-a performance that has been widely praised for its intensity, nuance, and magnetism.
In Swing Bout, O'Riordan also took on the role of producer, helping bring the gritty, emotionally charged story to life with a strong creative hand. This dual contribution, both on-screen and behind the scenes, earned her a Discovery Award nomination at the Dublin International Film Festival 2024. Swing Bout premiered at DIFF in February 2024, won Best Picture at the Paladino d'Oro Sports Film Festival, and enjoyed a four-week independent theatrical run in Ireland, drawing rave reviews from The Guardian and The Irish Examiner. Swing Bout is streaming in the UK and Ireland on Apple TV / Amazon Video / YouTube, and in the USA on Amazon Video.
O'Riordan's screen credits span drama, comedy, thriller, and genre work. She appeared in the multi-award-winning series The Dry (Element Pictures), Curers (Northern Ireland Screen), Mir (Madra Mór Productions), The Forest Dreams of the Past(2025), Conversations with my Dead Father (Screen Ireland), Sucking Diesel (Amazon Prime), Killers Within and Dead Along The Way (Amazon Prime).
As a producer, Sinéad also co-produced the Puttnam Award-winning short Wireless, which screened at Oscar- and BAFTA-qualifying festivals and is currently featured on Aer Lingus in-flight entertainment. She also co-produced the Screen Ireland-funded Conversations with My Dead Father, which won Best in Cork at the Fastnet Film Festival 2022, Dead Along The Way Feature Film (Amazon Prime) and Sucking Diesel web-series (Amazon Prime).
Beyond her own films, Sinéad has worked as an EPK Producer on major Netflix and Apple TV projects, including Lift (Kevin Hart) and Swagger (O'Shea Jackson Jr.), among others.
She has served as a judge, guest panelist, and host for various film festivals, including the Dublin International Film Festival, Cork International Film Festival and the Irish Film & Television UK.
