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.