Laura Eveliina Birn (born 25 April 1981 in Helsinki) is a Finnish actress. She has tackled roles in historical dramas, lighthearted comedies, and thought-provoking art-house films with equal finesse. Her performance in the 2012 film Purge earned her a Jussi Award for Best Actress and a nomination for a Satellite Award for Best Actress. In 2021 she began playing the role of robot Eto Demerzel in the series Foundation.

Birn has also appeared in films Pearls and Pigs (2003), Promise (2005), Christmas Story (2007), Naked Harbour (2012), Heart of a Lion (2013), Walk Among the Tombstones (2014), The Ones Below (2015), Helene (2020), and The Crow (2024). Her performance in the mystery drama series Munkkivuori earned her a Golden Venla award for Best Supporting Actress in 2022.

Birn completed her master's degree from Helsinki Theatre Academy in 2008. In 2024, Finnish weekly news magazine Suomen Kuvalehti wrote, sourcing publicly available tax records, that Birn is the most highly-paid Finnish actor or actress of all time.