The Mishihase (粛填) were a people of ancient Japan, believed to have lived along the northern portion of the coast of the Sea of Japan.

They are believed to have spoken a Tungusic language.

The name Sushen, which is rendered 肅愼 but pronounced Mishihase or Ashihase in Japanese, can also be found in Japanese documents. According to the Nihon shoki, the Mishihase first arrived at Sado Island during the reign of Emperor Kimmei. In 660, Japanese General Abe no Hirafu 阿倍比羅夫 defeated the Mishihase in Hokkaidō at the request of the Ezo. Some historians consider that the Mishihase were identical to the Sushen in Chinese records, but others think that the Japanese named the indigenous people in the northeast based on their knowledge of Chinese records, just as the Chinese did during the Three Kingdoms Period.