Obizzo III d'Este (14 July 1294 – 20 March 1352) was the marquess of Ferrara from 1317 until his death.
He was the son of Aldobrandino II d'Este and Alda Rangoni.
Aldobrandino was lord of Ferrara together with his brother Rinaldo and Niccolò, and his cousin Folco II, but in the end reigned as sole ruler. He managed to enlarge the family possessions with the conquests of Modena (1336) and Parma (1344–1346).
He married first in 1317 Jacopa Pepoli and then in 1347 Lippa Ariosti. Obizzo died in 1352, being succeeded by his son Aldobrandino.
| Preceded by Aldobrandino II |
Marquess of Ferrara 1317–1352 |
Succeeded by Aldobrandino III |