George Washington Longan (January 20, 1819 – March 11, 1891) was an American preacher and educator whose ministry within the Disciples of Christ movement spanned over four decades, emphasizing biblical restoration and Christian unity. Born in Georgetown, Kentucky, to Samuel Longan and Nancy Chilton, he grew up in a family that moved to Missouri in his youth, shaping his frontier faith. Largely self-educated due to limited formal schooling, he studied under early Disciples leaders like Alexander Campbell, whose influence led to his ordination around 1840 after a conversion in his late teens. Longan’s preaching career began in Missouri, where he served churches in St. Louis, Hannibal, and Fulton, delivering sermons that called for a return to New Testament Christianity, free of denominational creeds. A gifted writer, he contributed to The Millennial Harbinger and authored Origin of the Disciples of Christ (1889), defending the movement against critics like William H. Whitsitt. He also taught at Christian University (now Culver-Stockton College) in Canton, Missouri, mentoring future ministers. Married to Catherine Herdman in 1843, with whom he had several children, including a son who became a preacher, he passed away at age 72 in Kansas City, Missouri.