The North East Derbyshire by-election was a Parliamentary by-election. It returned one Member of Parliament to the House of Commons of the United Kingdom, elected by the first past the post voting system. About a third of the electorate were directly involved in the mining industry. This was the penultimate by-election to take place before the outbreak of the First World War. It demonstrated the weakness of support for the Labour party in 1914 when opposed by a Liberal party candidate.