We would like to thank everyone who attended and took part in OSN.. Olimpiade Sains Nasional (OSN) is one of the competitions that conducted to gather excel young people in the field of science. OSN is organized for all students from different level. For high school level, OSN is performed for various fields of science, such as mathematics, physics, biology, computers, geography, and other social sciences. SMA Labschool Unesa send 27 student to follow OSN. To prepare the students, our teachers giving mentoring intensively.