Biston regalis is a moth of the Geometridae family. It is found in China (Liaoning, Henan, Shaanxi, Gansu, Zhejiang, Hubei, Jiangxi, Hunan, Fujian, Hainan, Sichuan, Yunnan), Taiwan, Russia (Amur, Ussuri), Japan, North Korea, South Korea, India, Nepal, the Philippines, Pakistan and the United States.