McElligott grew up in Dublin. She began acting during secondary school. She is a graduate of University College Dublin.
She starred in Moon (2009) and the RTÉ television series Raw before leaving to film Leap Year (2010). In 2011, she starred at the movie The Guard. From 2011 to 2012, she played a lead role in the AMC series Hell on Wheels. In 2015, she starred in ABC's The Astronaut Wives Club. In 2016, McElligott played Hannah Conway, wife of the Republican presidential nominee, in the fourth and fifth season of the Netflix show House of Cards. She plays Queen Maeve on Amazon Prime Video's original series The Boys, which is based on the comic book series of the same name.

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