O’Higgins theatre credits include performances at London's Old Vic and the English National Opera and television roles include the BBC drama’s My Mother And Other Strangers and Emma and Enid. O’Higgins appeared in the film Brooklyn as Nancy, the best friend of Saoirse Ronan’s character Ellis.
O’Higgins is best friends with Brooklyn co-star Saoirse Ronan and they have attended the Golden Globes together. Ronan mentioned Higgins in her acceptance speech when winning a Best Actress in a motion picture, comedy or musical’, for Lady Bird at the 2018 Global Globes.
- "Castlewellan's Eileen O'Higgins on her journey to the Oscars". The Irish News.
- "BBC - Eileen O'Higgins plays Emma Coyne - Media Centre". www.bbc.co.uk.
- Murphy, Niall (14 September 2017). "Eileen O'Higgins joins cast of Josie Rourke's Mary, Queen Of Scots". Scannain.
- "History Scotland's exclusive interview with Eileen O'Higgins, who plays Mar". www.historyscotland.com.
- "TheJournal.ie - Saoirse Ronan gave a shoutout to her best friend Eileen in her Golden Globes speech, but do you recognise her?". www.dailyedge.ie.