Marylebone East was a borough constituency located in the Metropolitan Borough of St Marylebone, in London.

It 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 voting system.

The wards of Cavendish Square, Dorset Square and Regent's Park, Portland Place, and St John's Wood Terrace.

Beresford was appointed Lord Commissioner of the Admiralty, requiring a by-election.

Beresford resigned, causing a by-election.