Azzo V d'Este

Azzo V d'Este (1125–1193) was an Italian nobleman, the son of Margrave Obizzo I. In 1176 he married Marchesella Adelardi, heiress of the Adelardi, the leading Guelph family of Ferrara; the marriage brought the Este large estates and leadership of its Guelph party, opening the road to the later Este lordship of Ferrara.

He died prematurely in 1193, shortly before Obizzo I, so he never reigned. The succession passed to his son Azzo VI.