The National Science Olympiad (NSO) is a yearly competitive exam conducted for school students. It is organized by the Science Olympiad Foundation (SOF), which is a nonprofit organization that is dedicated to promoting the principles of excellence in science and engineering education through its programs and competitions.

The NSO exam is designed to test students' knowledge and understanding of the fundamental concepts and techniques of science, as well as their ability to apply those concepts to solving problems.

Students can choose between three levels of competition: Individual, Pair, and Team.

In addition to being a test of knowledge, the NSO exam is also a test of logical reasoning, scientific reasoning, and critical thinking.