Teiaiagon was an Iroquoian village on the east bank of the Humber River in Toronto, Ontario, Canada. It was located along the Toronto Carrying-Place Trail. The site is near the current intersection of Jane Street and Annette Street, at which is situated the community of Baby Point.
The establishment of the village has faded into time immemorial. Percy Robinson's Toronto Before the French Regime shows Teiaiagon as being a jointly occupied village of Seneca and Mohawk. Helen Tanner's Atlas of Great Lakes Indian History describes Teiaiagon as a Seneca village around the years 1685-1687, although it existed before that time, and as a Mississauga village around 1696.
Though the regional population movements were complex, a major shift in the village history as displayed in archaeological evidence appears to have been connected to the formation of a league among the five Iroquois nations south of Lake Ontario before the arrival of Europeans. The "League Iroquois" engaged in escalating warfare against other Iroquoians.
Étienne Brûlé passed through Teiaiagon in 1615. The village was on an important route for the developing fur trade industry, and was also "surrounded by horticultural fields". It was said to be about "a day's journey from the Toronto Lake, our present Lake Simcoe".
On November 18, 1678 René-Robert Cavelier, Sieur de La Salle departed Fort Frontenac for Niagara in a brigantine with a crew including La Motte and the Récollet missionary Louis Hennepin, following the north shore of Lake Ontario to mitigate the effects of a storm. The ship was grounded three times, forcing the crew to stop at the mouth of the Humber River on 26 November. The surprised inhabitants of the village "were hospitable and supplied them with provisions". On December 5, the ship set off after being cut out of the ice with axes. Before departing, "La Motte's men bartered their commodities with the natives" for corn.