The 1914 Poplar by-election was a Parliamentary by-election held on 19 February 1914. The constituency returned one Member of Parliament (MP) to the House of Commons of the United Kingdom, elected by the first past the post voting system.

Poplar was a parliamentary constituency centred on the Poplar district of the East End of London. It returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom.