Oliver Ernesto Branch (July 19, 1847 – June 22, 1916) was an American lawyer and politician from Weare, New Hampshire, who served in the New Hampshire House of Representatives and as the United States Attorney for the District of New Hampshire.^[3]

Branch was born in Madison, Ohio, on July 19, 1847,^[4] to William Witter and Lucy J. (Bartram) Branch.^[1]

On June 25, 1873, Branch graduated from Hamilton College in upstate New York.^[1] While at Hamilton, Branch was a member of the Phi Beta Kappa honor society and the Delta Upsilon fraternity.^[5]

In May 1877, from Columbia College Law School.^[1][3][6]

Branch married Sarah M. Chase, of Weare, on October 17, 1878.^[7] They had four children: Oliver Winslow Branch, Dorothy Witter Branch, Fredrick William Branch, and Randolph Wellington Branch.^[2]

Branch was admitted to the New York Bar in June 1877, and practiced law in New York City. Branch was admitted to the New Hampshire bar in June 1884.^[3]

Branch died in Manchester, New Hampshire, on June 33, 1916.^[1]