Ronald "RJ" Cyler II is an American actor. He is best known for his roles in the films Me and Earl and the Dying Girl (2015), Power Rangers (2017), The Harder They Fall (2021), and Emergency (2022) as well as the Showtime series I'm Dying Up Here (2017–2018) and Scream: Resurrection (2019).

Me and Earl and the Dying Girl is a 2015 American coming-of-age comedy-drama film directed by Alfonso Gomez-Rejon from a screenplay by Jesse Andrews, based on Andrews' 2012 novel of the same name. The film stars Thomas Mann, RJ Cyler and Olivia Cooke. It follows a socially awkward teenage boy who, along with an acquaintance, befriends a classmate after she is diagnosed with cancer. The film premiered at the 2015 Sundance Film Festival and was released in the United States on June 12, 2015, by Fox Searchlight Pictures. It received positive reviews from critics, who praised the screenplay and cast.