Rein Maychaelson is an Indonesian film director and screenwriter. Rein attended Universitas Multimedia Nusantara, majoring in film. He directed many short films such as Udin Telekomsel (2015), A Dinner with Astronaut (2016), and Errorist of Seasons (2017). He also directed the web-series Neo Batavia (2018).

His films are already recognized in more than 25 national and international film festivals, which includes Jogja-NETPAC Asian Film Festival, XXI Short Film Festival, San Francisco Indonesian Film Festival, Los Angeles Indonesia Film Festival, Bangkok International Film Festival, Europe on Screen, Viddsee Jurree Award, etc.