Isaac was a partner in the army contracting business run by his older brother Samuel (1812–1886), which became the largest European supplier of materials to the Confederate States during the American Civil War.
He was elected at the 1874 general election as a Member of Parliament (MP) for Nottingham, when the Conservatives took both the city's parliamentary seats from the Liberals. The election return describes him as a colliery proprietor, of Colwick Hall, Nottinghamshire.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "N" (part 3)[self-published source][better source needed]
- "The Jubilee Of Jewish Emancipation". The Times (London). 25 July 1908. pp. 16, col A.
- "Isaac, Samuel". Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900.
- The London Gazette: . 6 February 1874. Retrieved 15 November 2010.
- Craig, F. W. S. (1989) . British parliamentary election results 1832–1885 (2nd ed.). Chichester: Parliamentary Research Services. p. 230. ISBN 0-900178-26-4.
- Craig, F. W. S. (1989) . British parliamentary election results 1885–1918 (2nd ed.). Chichester: Parliamentary Research Services. p. 13. ISBN 0-900178-27-2.
- Hansard 1803–2005: contributions in Parliament by Saul Isaac
|Parliament of the United Kingdom|
|Member of Parliament for Nottingham
1874 – 1880
With: William Evelyn Denison
John Skirrow Wright
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