Lorenzo Welton Elder, M.D. (April 15, 1820 - May 11, 1892) was an American physician and politician who served as the sixth mayor of Hoboken, New Jersey from 1863 to 1864 during the American Civil War. It was through his efforts that the was established. He was president of the Hudson County Pathology Society and was deputy adjutant-general on the staff of Governor Rodman McCamley Price. He was the local medical examiner of the Mutual Benefit Life Insurance Company of Newark, New Jersey, and of the New York Life Insurance Company. He was three times elected as the tax commissioner for Hoboken.