| Honorific-Prefix: | Hon. |
| Oliver Ernesto Branch | |
| Office: | 26th United States Attorney for the District of New Hampshire |
| Appointed: | Grover Cleveland |
| Office2: | Member of the New Hampshire House of Representatives |
| Term Start2: | 1888 |
| Term End2: | 1892 |
| Office4: | Moderator of the Weare, New Hampshire Town Meeting |
| Birth Date: | July 19, 1847 |
| Death Date: | June 22, 1916 |
| Alma Mater: | Hamilton College, June 25, 1873; Columbia College Law School, May 1877 |
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.
Branch was born in Madison, Ohio, on July 19, 1847, to William Witter and Lucy J. (Bartram) Branch.
On June 25, 1873, Branch graduated from Hamilton College in upstate New York. While at Hamilton, Branch was a member of the Phi Beta Kappa honor society and the Delta Upsilon fraternity.
In May 1877, from Columbia College Law School.
Branch married Sarah M. Chase, of Weare, on October 17, 1878.[1] They had four children: Oliver Winslow Branch, Dorothy Witter Branch, Fredrick William Branch, and Randolph Wellington Branch.
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.
Branch served in the New Hampshire House of Representatives from 1888 to 1892.
On March 15, 1894, Branch was appointed by President Grover Cleveland to be the United States Attorney for the District of New Hampshire.
Branch died in Manchester, New Hampshire, on June 33, 1916.