William Charles Wentworth-FitzWilliam, Viscount Milton (18 January 1812 – 8 November 1835) was an English nobleman and politician.
Viscount Milton had retired from Parliament in 1830 following the death of his wife, and had accepted the Northamptonshire nomination but refused to campaign.
Ten days into the parliamentary term, his grandfather, Earl Fitzwilliam, died, meaning that his father succeeded to the earldom and Wentworth-FitzWilliam became the new Viscount Milton.
[5] While a substantial number of MPs were still elected as minors during the eighteenth century, and allowed to take their seats, this had fallen out of practice by the time of the 1832 Reform Act.
[5] Wentworth-Fitzwilliam is believed to have been the only minor returned to Parliament after 1832, and would remain the youngest post-Reform MP until 2015, when Mhairi Black was elected aged 20 following a change in the law.