The development of information and communication technology is very fast. Including the development of mobile technology that delivers smartphone with a lot of functions, not only as a communication device but also as a source of information. It creates the public demand for information and encourages educational institutions, including SMAN 9 Manado to use it. Research titled “Registrasi Calon Siswa Baru Berbasis Mobile Android di SMA Negeri 9 Manado” aims to assist prospective students to enroll using mobile devices and assist the school to process the enrollment data. The client is developed using Java programming language and runs on Android operating system, while the server developed using PHP programming language and runs on Windows operating system. The Agile Unified Process is used as the software development methodology.