John Guerrant Miller (October 4, 1812 – March 18, 1856) was a nineteenth-century American politician and lawyer who served as a United States Representative from Missouri.
Born in Danville, Kentucky, Miller received his early education in local schools and graduated from Centre College in 1832. He studied law and was admitted to the bar, moving to Boonville, Missouri, in 1835 to engage in legal practice.
Miller's political career began in the Missouri House of Representatives, where he served a term in 1840. He was subsequently elected as a Whig to the Thirty-second and Thirty-third Congresses, serving from March 4, 1851, to March 3, 1855. During the Thirty-fourth Congress, he was re-elected as an Opposition Party candidate and served as the chairman of the Committee on Public Lands.
Miller died in office near Marshall, Missouri, on March 18, 1856. He was interred in the City Cemetery in Boonville, Missouri.