Augustin Magloire Alexandre Blanchet (22 August 1797 – 25 February 1887) was a French Canadian prelate of the Roman Catholic Church.

Along with his elder brother and other fellow French Canadian missionaries, Blanchet established the Catholic Church presence in what later became Washington.

[1] Blanchet was ordained to the priesthood on 3 June 1821 for the Archdiocese of Quebec and held several church positions in Lower Canada, mainly around Montreal, and in the Cape Breton region what was then the British colony of Nova Scotia.

Francois Blanchet had set up a Catholic church presence there in 1838, serving a bishop of the Diocese of Oregon City.

This animosity, along with warfare between the Army and the Cayuse and the failure of the diocese to grow, prompted the Vatican to move Blanchet to a new episcopal see in St. Paul in the Willamette Valley.

[2][4] On 31 May 1850, Pope Pius IX established the Diocese of Nesqually (later spelled "Nisqually"), with its episcopal see in Vancouver, Washington, in what was by then known as the Oregon Territory, and named Blanchet bishop.

In 1955, a priest conducting an exhumation of Blanchet's body to transport to a different burial site declared that it was incorrupt, or preserved by miraculous processes.