George Washington Morse (24 June 1816 – 9 November 1909) was a Seventh-day Adventist pioneer. As a Millerite Adventist, he experienced the Great Advent Awakening including the Great Disappointment of October 22, 1844. He joined the Sabbath-keeping Adventists in the late 1840s and remained a member until he died 60 years later. He witnessed the SDA Church's development for over a half of a century.