Harada Nobutane (原田 信種, 1560–1598) was a Japanese samurai of the Sengoku period through Azuchi–Momoyama period, who served the Akizuki clan of Kyūshū.
His court title was Shimotsuke no kami (下野守).
He was born to Kusano Chikanaga,[1] but was adopted as heir to the Harada family.
He became a vassal of Toyotomi Hideyoshi following Hideyoshi's invasion of Kyūshū; Harada then served as yoriki under Sassa Narimasa and Katō Kiyomasa.
He joined Katō Kiyomasa's force in Korea, and died at the Siege of Ulsan.