Kiera Allen est née le 29 décembre 1997 dans l'état de New York, États-Unis. Elle est actrice et scénariste. Elle est connue pour Run (2020), Five Questions (2023) et Littlemouth.
Since 2014, Kiera has used a wheelchair for mobility for undisclosed reasons. With her leading role as Chloe in her feature film debut, Run (2020), she became the first real life wheelchair user to star in a major thriller in 73 years, since Susan Peters in The Sign of the Ram (1948).