Neeley Dayan was born on December 24, 2001, in Baltimore. She gained her first acting experience in school plays. From 2015 to 2020, she attended Towson High Law & Public Policy in Towson , Maryland. In 2020, she began studying psychology at Loyola Marymount University, graduating with a bachelor's degree in 2024. That same year, she made her film debut in the science fiction film Alien: Rubicon, playing the daughter of the main character portrayed by Preston Geer. Also in 2024, she played the major role of Eva in the horror film Heretics.
