John Slagg (junior) (24 Oct 1837 – 7 May 1889) was a British businessman and Liberal politician. He was elected to membership of the Manchester Literary and Philosophical Society on 25 January 1859 Complete List of the Members & Officers of the Manchester Literary & Philosophical Society, from its institution on February 28th, 1781, to April 28th, 1896. Page 35
He was the eldest son of John Slagg, a justice of the peace at Manchester, and his wife Jane née Crighton.Obituary, The Times, 8 May 1889, p. 7The New Members of Parliament, The Times, 6 April 1880, p. 4 John Slagg senior was a commission agent and merchant in the city. His friend, Anti Corn Law campaigner Richard Cobden was his son's godfather.Richard Cobden, Anthony Howe, Simon Morgan, Gordon Bannerman, The Letters of Richard Cobden: Volume I: 1815-1847, Oxford, 2007
Slagg followed his father into business, and became president of the Manchester Chamber of Commerce. In 1885 he was appointed as a director of the Suez Canal Company.The Suez Canal, The Times, 1 June 1885, p. 5 He made his home at Hopefield, Pendleton.
In 1880 he was elected as one of Manchester's three members of parliament. The Redistribution of Seats Act 1885 divided the Manchester constituency into six divisions, and Slagg stood as the Liberal candidate at Manchester North West, but was defeated. He returned to the Commons at a by-election in 1887 at Burnley.
In 1866 he married Katherine German of Sevenoaks, Kent.
John Slagg died at his Mayfair, London home in May 1889, aged 51.Deaths, The Times, 9 May 1889, p. 1
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