Truman Leonard (1820-1897) was a farmer in Utah. He served as a missionary for the Church of Jesus Christ of Latter-day Saints in India and Ohio.

Truman Leonard was born on September 17, 1820 in Middlesex, Ontario County, New York. His parents were Truman Leonard Sr. and Roxanna Allis. He married Ortentia White (1846), Mary Ann "Polly" Meadows (1857), and Margaret Evans Bourne (1857). His children with Ortentia were Ezra Newton (1846-1846), Truman Milton (1849-1850), Sarah (1851-1851), Helen Mar (1852-1931), Clara Amelia (1856-1897), Benjamin Franklin (1857-1857), Mary Moselle (1858-1859) Julia Ortentia (1860-1860), John Carlos (1864-1864), and Hattie Adelle (1867-1938). Mary Ann "Polly" gave him seven children: Eugenia Evaline (1855-1941), Alice Arabella (1860-1948) Annie Marie "Maria" (1863-1920), Amy Louise (1865-1936) George Marvin (abt. 1868-1930), Truman Jay (1871-1909), and Mary Moselle "Mame" (1874-1950). No children from Margaret Evans are recorded. He served two missions for the Church of Jesus Christ of Latter-day Saints in his life: one to India, and one to Ohio and Pennsylvania. He also led a company of pioneers across the plains in 1856. He worked hard on his farm raising livestock and crops. Leonard died on November 20, 1897 in Farmington, Davis County, Utah.