Egerton was the third son of Francis Egerton, 1st Earl of Ellesmere, younger son of George Leveson-Gower, 1st Duke of Sutherland. His mother was Harriet Catherine, daughter of Charles Greville, while George Egerton, 2nd Earl of Ellesmere, and the Honourable Francis Egerton were his elder brothers.
Egerton entered the House of Commons for Lancashire South in 1859, a seat he held until 1868, and then represented Lancashire South-East from 1868 to 1880 and Wigan from 1882 to 1885. He held office under Benjamin Disraeli as Parliamentary Secretary to the Admiralty from 1874 to 1880.
Egerton married Alice Louisa, daughter of Lord George Cavendish, in 1863. They had two sons and seven daughters:
- Margaret Louisa Egerton (d. October 1950), married 10 October 1901 George Chichester May (d. 3 November 1924), son of George Augustus Chichester May, Lord Chief Justice of Ireland.
- Blanche Susan Egerton (d. 1 November 1940).
- Sybil Mary Egerton (d. 27 August 1873).
- Mary Florence Egerton.
- Evelyn Harriet Egerton (d. 3 November 1964).
- Katherine Alice Egerton (1867 - 13 December 1962).
- George Algernon Egerton (1 December 1870 – 13 May 1915).
- Violet Ellinor Egerton (1873 - 6 March 1968) married Frederick Walter Stephenson (d. 19 May 1944) on 27 January 1914.
- Ralph Greville Egerton (27 November 1876 – 9 January 1877).
Egerton died in July 1891, aged 65. His wife survived him by fourteen years and died in March 1905.
- Leigh Rayment's Peerage Pages [self-published source][better source needed]
- Lundy, Darryl. "FAQ". The Peerage.[unreliable source]
- Hansard 1803–2005: contributions in Parliament by Algernon Egerton
|Parliament of the United Kingdom|
|Member of Parliament for Lancashire South
1859 – 1868
With: William Legh 1859–1868
Charles Turner 1861–1868
(representation increased to three members 1861)
|New constituency||Member of Parliament for Lancashire South-East
1868 – 1880
With: John Snowdon Henry 1868–1874
Edward Hardcastle 1874–1880
|Member of Parliament for Wigan
1882 – 1885
With: Thomas Knowles 1882–1883
Nathaniel Eckersley 1883–1885
(representation reduced to one member 1885)
|Parliamentary Secretary to the Admiralty