Henry Augustus Dillon-Lee, 13th Viscount Dillon (1777–1832), was an Irish politician, soldier and writer. Despite being a Protestant, he supported Catholic emancipation in Ireland and wrote on the topic. He sat as MP for Harwich in England in the last parliament of Great Britain and the first parliament of the United Kingdom. In the second parliament of the United Kingdom he sat for County Mayo in Ireland. Through his daughter Henrietta, He was ancestors to Clementine and to the Mitford sisters.

Harwich was a parliamentary constituency represented in the House of Commons of the Parliament of the United Kingdom until its abolition for the 2010 general election.