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Sinéad Keenan (born 27 December 1977) is an Irish actress with a wide range of television, film, and stage credits. Keenan is best known for playing Farrah Phelan in Fair City and for playing the role of a werewolf called Nina Pickering on BBC Three's supernatural drama Being Human. She has played DCI Jessica James in ITV1 drama Unforgotten since 2023.
| Year | Title | Role | Notes |
| 1999 | Fair City | Farrah Phelan | |
| 2001 | The Cassidys | Lisa Cassidy | |
| 2004 | Murder City | Young mother | Series 1, Episode 5 |
| 2007 | Taggart | Alic Martin | Series 23, Episode 3 - Tenement |
| 2008 | Doctors | Elena | Series 10, Episode 22 - Larp |
| Moving Wallpaper | Kelly Hawkins | ||
| 2009 | Comedy Showcase | Wendy | Series 2, Episode 4 - The Amazing Dermot |
| Agatha Christie's Poirot | Nora Brent | Series 12, Episode 1 - "The Clocks" | |
| Victoria Wood's Mid Life Christmas | Delia Smith's secretary | ||
| 2009–2010 | Doctor Who | Addams | "The End of Time" |
| 2009–2011 | Being Human | Nina Pickering | Series One, Episodes 2–6, Series Two, Episodes 1–4, 7, 8. Series Three, Episodes 1–8 |
| 2010 | Victoria Wood's Little Cracker | Mrs Whitefield | Short for Sky1 |
| 2011 | Silent Witness | Naomi Silverlake | Series 14, Episode 1–2 - A Guilty Mind |
| 2012 | Lip Service | Nora | Series 2 |
| 2013 | London Irish | Bronagh | Channel 4 |
| The Five(ish) Doctors Reboot | Doctor Who fan | BBC Red Button | |
| 2015 | Uncle | Maggie | Series 2, Episode 5 - A Guilty Mind |
| 2017 | Little Boy Blue | Melanie Jones | |
| 2018 | Care | Claire | 90-minute drama by Jimmy McGovern and Gillian Juckes |
| 2019 | Porters | Dr. Bartholomew | Series 2, 5 episodes |
| Deep Water | Roz | ITV | |
| 2020 | My Left Nut | Patricia Campbell | BBC |
| 2021 | Three Families | Theresa Ryan | Two-part drama for BBC One |
| Showtrial | Detective Inspector Paula Cassidy | Five-part drama for BBC One | |
| 2022 | Derry Girls | Aideen | Series 3, episode 3 |
| 2023–present | Unforgotten | Detective Chief Inspector Jessica James | Series 5. Six-part crime drama for ITV |
| 2026 | How to Get to Heaven from Belfast | Robyn | 8 episodes |
| Year | Title | Role | Notes |
| 2009 | Doctor Who Confidential | Herself | Lords and Masters, Allons-y! |
| 2011 | Alan Carr: Chatty Man | Herself | Series 5, Episode 7 |
| Year | Title | Role | Notes |
| 1999 | Sunburn | Margaret | Keenan's first role |
| 2001 | On the Nose | Sinead Delaney | |
| 2003 | Conspiracy of Silence | Majella | |
| 2004 | Mind of the Crime | Carrie | TV movie |
| 2006 | Trouble with Sex | Kathy |
| Year | Title | Role | Radio station / production company |
| 2011 | Crimes Of Mancunia | DCI Lise Lazard | BBC Radio 4 |
| 2014 | Doctor Who: Iterations of I | Aoife | Big Finish Productions |
| 2025 | Discretion | Maria Kossecka | Hat Trick Productions for BBC Radio 4 |
| Year | Title | Role | Theatre / notes |
| 2003 | Loyal Women | Adele | Royal Court Theatre |
| 2005 | The American Pilot | Evie | The Other Place |
| 2005 | Comedy of Errors | Luciana | Royal Shakespeare Theatre |
| 2006 | A Midsummer Night's Dream | Hermia | Novello Theatre |