The Mormon War is a name sometimes given to the 1838 conflict which occurred between Latter Day Saints (Mormons) and their neighbors in the northwestern region of the US state of Missouri. This conflict is also sometimes referred to as the Missouri Mormon War to differentiate it from the Utah Mormon War (also known as the "Utah War") and the lesser known Illinois Mormon War.

The specific dates of the war are from August 6, 1838, (the Gallatin election battle) to November 1, 1838, when Joseph Smith surrendered at Far West. During the conflict 22 people were killed (3 Mormons and 1 non-Mormon at Crooked River, one Mormon prisoner fatally injured while in custody, and 17 Mormons at Haun’s Mill). An unknown number of non-combatants died due to exposure and hardship as a result of being expelled from their homes in Missouri.

The conflict was preceded by the eviction of the Mormons from Jackson County, Missouri, in 1833.

All of the conflicts in the Mormon War occurred in a corridor 100 miles (160 km) to the east and northeast of Kansas City, Missouri.

Mormon War may refer to:

William "Bill" Maher, Jr. ( /ˈmɑːr/; born January 20, 1956) is an American stand-up comedian, television host, political commentator, author, and actor. Before his current role as the host of HBO's Real Time with Bill Maher, Maher hosted a similar late-night talk show called Politically Incorrect originally on Comedy Central and later on ABC.

Maher is known for his political satire and sociopolitical commentary, which targets a wide swath of topics including religion, politics, bureaucracies of many kinds, political correctness, the mass media, greed among people and persons in positions of high political and social power, and the lack of intellectual curiosity in the electorate. He supports the legalization of marijuana and same-sex marriage, and serves on the board of PETA. He is also a critic of religion and is an advisory board member of Project Reason, a foundation to promote scientific knowledge and secular values within society. In 2005, Maher ranked at number 38 on Comedy Central's 100 greatest stand-up comedians of all time. Bill Maher received a Hollywood Walk of Fame star on September 14, 2010.

John Corrill (September 17, 1794 – September 26, 1842) was an early member and leader of the Church of Jesus Christ of Latter Day Saints, and an elected representative in the Missouri State Legislature. He was prominently involved in the Mormon conflicts in Missouri before leaving the church in 1839 and publishing A Brief History of the Church of Christ of Latter Day Saints (Commonly Called Mormons).

Corrill was born near Barre, Massachusetts. He worked as a carriage builder, surveyor, and architect and married a woman named Margaret, with whom he had at least five children. Historians believe his writing ability and personal library suggest he may have had some formal education.

While living in Harpersfield, Ohio in 1830 the town was visited by Oliver Cowdery, Parley P. Pratt, Peter Whitmer, and Ziba Peterson, Mormon missionaries on their way to Missouri. After reading from the Book of Mormon, Corrill decided it was a fraud. He was later surprised to hear of the conversion of Sidney Rigdon, a preacher in nearby Kirtland who was planning a preaching tour with Corrill. While visiting Kirtland, Corrill attended some Mormon meetings and witnessed miraculous speaking in languages unknown to the speakers. After further investigation, he was baptized on January 10, 1831. A few later he was ordained an Elder.