Robert Lansing (/ˈlænsɪŋ/; February 2, 1799 – October 3, 1878) was an American lawyer and politician from New York.
[5] In 1817, he removed to Watertown, studied law there with Egbert Ten Eyck, and was admitted to the bar in 1820.
He was District Attorney of Jefferson County from 1826 to 1833, when he was succeeded by George C. Sherman (the father-in-law of his nephew Frederick Lansing).
[6] Afterwards he practiced law in partnership with George C. Sherman, who was then his brother-in-law.
Together, they were the parents of several children, only one of whom lived to maturity:[5] On February 2, 1841, Lansing married Cornelia Hubbard (1804–1885), a younger sister of his first wife.