Olivia Hamilton (born June 3, 1987) is an American actress and producer. She is best known for her roles in the films La La Land (2016), First Man (2018), and Babylon(2022), which were all directed by her husband Damien Chazelle.

In 2013, she founded the PLAY initiative, an organization dedicated to encouraging and injecting more fun and playfulness into people's lives while reconnecting them with their inner child. According to the foundation's website, PLAY is a two-hour guided experience. Hamilton is also the president of the Women's Foundation of California Board of Directors.