Kaitlyn Rochelle Dever (; born December 21, 1996) is an American actress. She started her career as a child actress, filming the 2009 television movie An American Girl: Chrissa Stands Strong when she was 11-years-old, which first aired just days after she turned 12. She became known for her roles in series such as Justified (2011–2015), Last Man Standing (2011–2021), Unbelievable (2019), and Dopesick (2021). She earned Golden Globe Award nominations for Unbelievable and Dopesick, in addition to a Primetime Emmy Award nomination for Dopesick.

Dever has had supporting roles in the films Short Term 12 (2013), Detroit (2017), Beautiful Boy (2018), Dear Evan Hansen (2021), and Ticket to Paradise (2022). Her leading film roles were in Booksmart (2019), Rosaline (2022), and No One Will Save You (2023).