US National Academy of Sciences
- Country: United States
- Type: Science
- Website: nasonline.org
- Update: 05-02
The United States National Academy of Sciences (abbreviation: NAS) is a scientific organization in the United States, founded in 1863, composed of eminent scientists, with more than 2,000 members of the National Academy of Sciences and more than 400 foreign academicians, and publishes the prestigious scholarly journal, Proceedings of the National Academy of Sciences of the United States of America.