Omar Dwight Conger (April 1, 1818 – July 11, 1898) was a U.S. Representative and U.S. Senator from the state of Michigan. Conger was born in Cooperstown, New York and moved with his father, the Rev. E. Conger, to Huron County, Ohio in 1824. He pursued academic studies at the Huron Institute in Milan, Ohio, and graduated from Western Reserve College (now Case Western Reserve University) in Hudson, Ohio in 1841. He engaged in mineral explorations of the Lake Superior copper and iron regions in connection with the Michigan State Geological Survey 1845–1847. He engaged in the practice of law in Port Huron, Michigan in 1848 and was elected judge of the St. Clair County Court in 1850. He was a member of the Michigan State Senate 1855–1859, and served as President pro tempore in 1859. He was a me