|Herbert R. O'Conor|
|United States Senator
January 3, 1947 – January 3, 1953
|Preceded by||George L. P. Radcliffe|
|Succeeded by||James Glenn Beall|
|51st Governor of Maryland|
January 11, 1939 – January 3, 1947
|Preceded by||Harry W. Nice|
|Succeeded by||William Preston Lane, Jr.|
|Attorney General of Maryland|
|Preceded by||William Preston Lane, Jr.|
|Succeeded by||William C. Walsh|
November 17, 1896|
|Died||March 4, 1960
|Children||Herbert R. Jr., Eugene F., James P., Robert, and Mary P. O'Conor|
|Alma mater||Loyola College
University of Maryland School of Law
|Service/branch||United States Navy|
|Battles/wars||World War I|
Herbert Romulus O'Conor (November 17, 1896 – March 4, 1960) was the 51st Governor of Maryland, serving from 1939 to 1947. He also served in the United States Senate, representing Maryland from 1947 to 1953. He was a Democrat.
O'Conor was born in Baltimore, Maryland to James P. A. O'Conor and Mary Ann (Galvin) O'Conor. He received his B.A. degree from Loyola College and graduated from the University of Maryland School of Law in 1920. While in school, O'Conor was a reporter for the Baltimore Sun and Baltimore Evening Sun from 1919 to 1920. On November 24, 1920, O'Conor married Mary Eugenia Byrnes (1896–1971) and they had five children, Herbert R. Jr., Eugene F., James Patrick, Robert and Mary Patricia.
From 1921 to 1922, O'Conor served as the assistant state's attorney for Baltimore. In 1923, he was elected State's Attorney of Baltimore City, and served there until he was elected as the Attorney General of Maryland in 1934. O'Conor also served in the National Association of Attorneys General in 1937. His secretary, Camilla Conroy, died in the burning of the luxury liner SS Morro Castle in 1934. O'Conor identified her body which was found face under close to the wreck site.
O'Conor was elected as Governor of Maryland in 1938, defeating incumbent Republican governor Harry W. Nice. In doing so, he became the first Roman Catholic of Irish descent to serve in that position. As governor, O'Conor created the Maryland Council of Defense during the Second World War. He also worked towards improving the state transportation system, and worked towards the construction of new bridges over the Susquehanna and Potomac Rivers. He also worked with other states to encourage inter-state cooperation, and served in positions including the Chairman of the Governor's Conference in 1941, and the President of the Council of State Government in 1943.
Near the end of World War II, O'Conor sought to improve the effects of the War and founded the Commission on Post War Reconstruction and Development. He also sought to improve the Maryland healthcare system.
O'Conor was elected to the United States Senate in 1946, but chose not to run for re-election in 1952. In the Senate, Hughes served as chairman of the Special Committee on Organized Crime in Interstate Commerce during the Eighty-first Congress. After his tenure in Senate, he continued the practice of law in Baltimore and Washington, D.C., until his death in Baltimore. He is interred in New Cathedral Cemetery.
- Herbert R. O'Conor State Building in Baltimore, Maryland. A building created by an early James Rouse and Guy T. O. Hollyday committee using the 1947 Federal Redevelopment Act funds to subsidize development and resale for a profit. 
- Joseph Rocco Mitchell, David L. Stebenne. New City Upon a Hill. p. 39.
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (December 2007) (Learn how and when to remove this template message)|
- Herbert O'Conor. December 9, 1998. Maryland State Archives. October 25, 2004. 
- United States Congress. "Herbert O'Conor (id: O000032)". Biographical Directory of the United States Congress.
- Addresses, Messages and Public papers. From The Archives of Maryland
- A film clip "Longines Chronoscope with Sen. Herbert R. O'Conor (December 1, 1952)" is available at the Internet Archive
William Preston Lane, Jr.
|Attorney General of Maryland
William C. Walsh
Harry W. Nice
|Governor of Maryland
William Preston Lane, Jr.
|United States Senate|
George L. P. Radcliffe
|U.S. Senator (Class 1) from Maryland
Served alongside: Millard Tydings, John Butler
James Glenn Beall
|Party political offices|
George L.P. Radcliffe
|Democratic nominee for United States Senator from Maryland
George P. Mahoney
|80th||Senate: Tydings • O'Conor||House: D'Alesandro • Sasscer • Beall • Fallon • Meade • Miller|
|81st||Senate: Tydings • O'Conor||House: Sasscer • Beall • Fallon • Miller • Garmatz • Bolton|
|82nd||Senate: O'Conor • Butler||House: Sasscer • Beall • Fallon • Miller • Garmatz • Devereux|