Ewos?atewos (Ge'ez: ??????? ?Ewos?atewos, also Ge'ez: ?????? Yos?atewos, a version of Ancient Greek: ??st????? Eustathios; July 15, 1273 – September 15, 1352 according to the Julian calendar) was an important religious leader of the Orthodox Tewahedo during the early period of the Solomonic dynasty of Ethiopia.
He was a forceful advocate for the observation of the Sabbath in Christianity.
His followers, known as the House of Ewostatewos (individuals are known as Ewostathians), have been a historic force in Tewahedo Orthodoxy.