Azzo VIII d'Este (died 31 January 1308[1]) was lord of Ferrara, Modena and Reggio from 1293 until his death.
The early part of his rule was spent in almost continuous warfare: war with Padua at his accession and with Parma and Bologna in 1295–1299.
He was accused of the assassination of the podestà of Bologna, Jacopo del Cassero, who had opposed the Este expansion plans.
Modena and Reggio rebelled in 1306 over an attempt to assign them to Beatrice as part of the bride price, a custom that had been superseded in Italy by the dowry.
Francesco d'Este left Ferrara as Beatrice arrived and joined the coalition of cities that moved against Azzo in 1306, determined that he should not make himself lord of Lombardy.