The Appleby by-election was a Parliamentary by-election held on 2 March 1905. 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.

Appleby was a parliamentary constituency in the county of Westmorland in England. It existed for two separate periods: from 1295 to 1832, and from 1885 to 1918.