- Was unsure about having an acting career, until gaining recognition for Red Riding Trilogy.
- Attended Galway-Mayo Institute of Technology, where he studied film and television.
- Was in a relationship with Sofia Boutella (March 2014-October 2018).
- His favourite movie is American Beauty (1999).
- Robert Sheehan portrayed three characters who have similar powers, including immortality and seeing/speaking with the deceased. Klaus Hargreeves in The Umbrella Academy, Nathan Young in Misfits, and Jack in The Messenger.
- His father was a member of Garda Siochana, the police force of the Republic of Ireland.
- Currently resides in London, England and Los Angeles, California.
- In 2017, a local newspaper in his hometown (Laois Today) published an article titled Moment in Time: Schoolboy Robert Sheehan wins his first movie role, in reference to his role in Mortal Engines (2018).
- His elder brother, Brendan, is a mortgage broker and a director of Fitness Supplements.
- He is the youngest of three children of Joseph and Maria Sheehan.
- Born on the same date as Haley Bennett.
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