Obelerio degli Antenori (also Antenoreo) was the ninth traditional (seventh historical) Doge of Venice from 804 to 811.

Obelerio immediately copied his predecessors and appointed as associate doge one of his relatives, his brother Beato.

Soon the Antenori were out of favour and the feud between the various factions, the pro-Byzantine at Heraclea and the republican at Malamocco, had fired up.

The exiled patriarch of Grado, Fortunatus, returned to Venice from the court of Charlemagne at Aachen and offered to put Venetia under the protection of the Franks if he was reinstated.

He landed at Vigilia, near Malamocco, but the legitimate doge, Giovanni Participazio, razed the two cities and killed Obelerio, displaying his head in the market.