Torahiko Terada (寺田 寅彦 Terada Torahiko, November 28, 1878 - December 31, 1935) was a Japanese physicist and author who was born in Tokyo. He was a professor at Tokyo Imperial University, a researcher at RIKEN, and worked on a wide range of topics in physics. Also, he was a professor at the Earthquake Research Institute.
As an author, he studied under Natsume Sōseki, who was a teacher at his high school in Kumamoto. Terada is best known for his numerous essays on a wide variety of topics ranging from science to cinema, from haiku to manga.
Torahiko Terada, along with many important historical figures from the Meiji Restoration, is a central character in the fantasy/historical fiction novel Teito Monogatari by Hiroshi Aramata.