Lewis Crum Bidamon (January 16, 1806 – February 11, 1891) was a leader in the Illinois militia that assisted Latter Day Saints in the 1846 "Battle of Nauvoo". In 1847, Bidamon married Emma Smith, the widow of Joseph Smith, the founder of the Latter Day Saint movement; from this time, Bidamon was the stepfather of Joseph Smith III and the other surviving children of Joseph and Emma Smith.