Julien Garnier (born at Connerré, France, 6 January 1643; d. in Quebec, 1730) was a French Jesuit missionary to Canada, who wrote the first known dictionaries of the Seneca language.
There he taught grammar at the Jesuit college, while studying theology under Jérôme Lalemant and learning Indian languages in preparation for missionary work.
[2][3] His missionary work saw significant success among the Senecas, for whom conversion offered valuable military and trading alliances,[4] as well as access to medicine.
His replacement, de Denonville, betrayed the Seneca leaders under a flag of truce, before marching through their territory and burning their villages.
His departure marked the end of missionary work among the Senecas; his notes and letters remain one of the principal and most accurate sources of information on this division of the Iroquois.