Niamh Walsh is an Irish actress. She had her career beginnings in the 2010s, debuting in the short film Rat Trap. Shortly after, she played Hannah Spence in an episode of Casualty. This marked her television debut. In 2015, she played Maggie Kendall, a recurring part in Jekyll & Hyde. Walsh then starred as Cara Martinez in the BBC One series Holby City, gaining her wider recognition. Between 2017 and 2019, she became further known for her starring performance as Verity Rutter in the TV series Jamestown. This year, she played Greta Kleinschmidt in the web series Good Omens. She was recently cast for a main role on the upcoming series The English Game.