Éraste d'Odet d'Orsonnens (April 11, 1836 – December 24, 1906) was a notary, author and politician in Quebec.
He served as mayor of Hull from 1889 to 1890.
His name also appears as Jean-Éraste and Jean Protais Eraste.The son of Colonel Protais d'Odet d'Orsonnens and Louise-Sophie Rocher, he was born in Saint-Roch-de-l'Achigan, Lower Canada, and was educated at L'Assomption and at the Jesuit college in Montreal.
He went on to study law and was licensed as a notary at the age of 22.
D'Orsonnens practised his profession in Montreal, Warwick and Hull.
In 1875, he married Marie-Louise Fiset.
D'Orsonnens was also a commissioner of the Superior Court of Quebec and chair of the Hull school board.
Around the age of 50, he retired from practice as a notary to pursue his developing business.
He served on Hull municipal council from 1877 to 1886 and from 1890 to 1891.He published:
Felluna, la vierge iroquoise ; Une épluchette de blé-d'inde ; Une résurrection (1856) which is described as the first collection of stories published in Lower Canada
Une apparition : épisode de l'émigration irlandaise au Canada (1860)
Le moteur centripète (1899)Rue D'Orsonnens in Hull, now part of Gatineau, was named in his honour.