Mid Northamptonshire was a county constituency in Northamptonshire, which returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom, elected by the first past the post system.
1885–1918: The Municipal Borough of Northampton, the Sessional Divisions of Little Bowden and Northampton, and parts of the Sessional Divisions of Daventry (the parishes of Ashby St. Ledgers, Barby, Claycoton Crick, Elkington, Kilsby, Lilboume, Long Buckley, Stanford, Watford, West Haddon, Winwick, and Yelvertoft) and Kettering (the parishes of Draughton, Faxton, Glendon, Harrington, Loddington, Mawsley, Orton, Rothwell, and Thorpe Malsor).
Spencer was appointed Groom in Waiting, requiring a by-election.
Spencer is appointed Vice-Chamberlain of the Household, requiring a by-election.
The political parties had been making preparations for an election to take place and by July 1914, the following candidates had been selected;