- She is a huge sci-fi and fantasy fan and collects Star Wars figures.
- Worked several jobs prior to becoming an actress: at a piercing studio, in a cocktail bar, as a make-up artist for MAC cosmetics, worked for Image magazine, and as a wardrobe assistant on The Tudors (2007).
- She uses her natural Irish accent in the series Merlin (2008), while her co-star, Irish actor Colin Morgan fakes an English accent. Katie almost didn't get her role because "Merlin" producers didn't want two actors speaking with an Irish accent in the series, and they were ready to reject her for a role if she couldn't sound English, that is if Colin couldn't nail the English accent first.
- She did all of her own stunts in Jurassic World (2015).
- Compared to most aspiring actors, getting a job as an actress happened quickly for her. She made her on-screen debut in Damage (2007). Later that year, she was able to get an agent by October 2007 when one of the The Tudors (2007) crew drivers gave her a confidential cast list with all the actors' agents' details on it; a few months later, in January 2008, she read for Merlin (2008) and became a series regular.
- The only leading cast mate in Merlin (2008) who is not a formally trained actor.
- Became disinterested with her fashion job at Image magazine after eight months. Her mother's best friend, one of the top first-assistant directors in Ireland, had been working on The Tudors (2007) and gave Katie a job in the show's costume department because of her prior experience working in fashion; however, Katie didn't know how to sew and had no knowledge or experience in costume design.
- She is a big fan of Harrison Ford and Nathan Fillion.
- She loves comic books.
- McGrath studied the International Baccalaureate at St. Andrews College before graduating from Trinity College, Dublin with a degree in History.
- Revealed she never aspired to becoming an actress. She had no formal acting training outside of performing in school plays and did not attend drama school. She had been working as a wardrobe assistant on The Tudors (2007) when a couple of the show's producers and directors suggest she try acting. She wasn't interested, until she saw how more relaxed the actresses' jobs were on the set compared to her job working hard, long hours on costumes as a wardrobe assistant. This prompted her to take up acting and she made her on-screen debut in Damage (2007). She later convinced the director of The Tudors (2007) to give her a part in the series.
- Her last name is pronounced "Mc-Grah".
- Has a tattoo on her back that says 'Purity'.
- Friends with Colin Morgan and Jonathan Rhys Meyers.
- Friends with Natalie Dormer.
- Appears in both medias based on the Arthurian legends with the TV series Merlin (2008) as Morgana Pendragon and the movie King Arthur: Legend of the Sword (2017) as Elsa.
- Her brother Sean did the visual effects for Captain America: Civil War (2016).
- Worked under costume designer Joan Bergin on the set of The Tudors (2007).
- Has two brothers, Sean and Rory.
- Parents are Mary and Paul McGrath.
- Her great-grandfather was Joseph McGrath who was a politician in Ireland.
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