Aldobrandino I d'Este (c. 1190 – 10 October 1215) was the Marquis of Este and Ferrara, both in Italy.

He was co-ruler with his half-brother Azzo VII.

He was also the father of Saint Contardo of Este, a posthumous son.

His daughter Beatrice married King Andrew II of Hungary and thus became Queen of Hungary.

This Italian biographical article is a stub.