Lewis Cochran Cassidy
|Attorney General of Pennsylvania|
January 17, 1883 – January 18, 1887
|Governor||Robert E. Pattison|
|Preceded by||Henry W. Palmer|
|Succeeded by||William S. Kirkpatrick|
|Born||October 17, 1829|
New York City, New York
|Died||November 18, 1889 (aged 60)|
Germantown, Philadelphia, Pennsylvania
|Spouse(s)||Sallie Truman |
Lewis Cochran Cassidy (October 17, 1829 – November 18, 1889) was an influential Pennsylvania lawyer and politician, who served a term as state Attorney General.
Cassidy was born in New York City, the child of Irish immigrants. The family moved to Philadelphia shortly afterwards. His father died when he was ten. 
Cassidy attended Central High. Upon graduating, he learned law in the offices of Benjamin H. Brewster, and was admitted to the bar in 1849. He was immediately successful, and proved popular with the Moyamensing Hose Company, [Note 1] and elected to the state House for the 1851 term. In 1852, Cassidy was elected Solicitor for the District of Moyamensing. By 1856, Cassidy was already considered a local political "boss", and his influence helped elect Richard Vaux city mayor. He himself ran for District Attorney against William B. Mann, originally winning and inducted into office, but later losing after a judge ruled for Mann.  
During the Civil War and afterwards, he was a staunch supporter of Union and federal coercion. He became a local leader of Democratic party politics. His support helped Robert E. Pattison become Governor—the state's only Democratic governor between the Civil War and the Great Depression—and Pattison in turn appointed Cassidy state Attorney General. 
- "Mrs. Cassidy's funeral". Pittsburgh Commercial Gazette. July 24, 1884. p. 1.
- "Cassidy" 1893, p. 32.
- "Cassidy" 1893, p. 33.
- McCaffery 2010, p. 15.
- "Cassidy" 1893, p. 34.
- "Funeral of Lewis C. Cassidy". The New York Times. Nov 22, 1889. p. 1.
- "Lewis C. Cassidy Academics Plus School". webgui.phila.k12.pa.us. School District of Philadelphia. Retrieved 2015-05-20.
- Memorial of Hon. Lewis C. Cassidy. Allen, Lane & Scott. n.d.
- "Lewis C. Cassidy". Encyclopaedia of Contemporary Biography, of Pennsylvania. 3. Atlantic Publishing & Engraving Company. 1893. pp. 31–35.
- McCaffery, Peter (2010). When Bosses Ruled Philadelphia: The Emergence of the Republican Machine, 1867-1933. Penn State Press.
- Wilson, Kathryn; Coval, Jennifer (n.d.). "City of Unbrotherly Love: Violence in Nineteenth-Century Philadelphia" (PDF). hsp.org. Historical Society of Pennsylvania. Retrieved 2015-05-20.
Henry W. Palmer
Pennsylvania Attorney General
William S. Kirkpatrick