The House of Este is a European princely dynasty.

It is split into two branches; the elder is known as the House of Welf-Este or House of Welf (Guelf or Guelph), and the younger is known as the House of Fulc-Este or later simply as the House of Este.The elder branch of the House of Este includes the dukes of Brunswick and Lüneburg (1208–1918) and produces Britain's Hanoverian monarchs and one Emperor of Russia (Ivan VI).The younger branch of the House of Este includes rulers of Ferrara (1240–1597), and Modena and Reggio (1288–1796).