The manorial system of New France, known as the seigneurial system (French: Régime seigneurial, pronounced [ʁeʒim sɛɲœʁjal]), was the semi-feudal system of land tenure used in the North American French colonial empire. Economic historians have attributed the wealth gap between Quebec and other parts of Canada in the 19th and early 20th century to the persistent adverse impact of the seigneurial system.

Both in nominal and legal terms, all French territorial claims in North America belonged to the French king. French monarchs did not impose feudal land tenure on New France, and the king's actual attachment to these lands was virtually non-existent. Instead, landlords were allotted land holdings known as manors and presided over the French colonial agricultural system in North America.

The first grant of manorial land tenure in New France was awarded to Jean de Biencourt de Poutrincourt et de Saint-Just in 1604, with the Seigneury of Port-Royal in Acadia. This grant was reaffirmed by King Henry IV of France on February 25, 1606.

In 1628, Cardinal Richelieu expanded the Seigneurial system through the newly formed Company of One Hundred Associates which included all lands between the Arctic Circle to the north, Florida to the south, Lake Superior in the west, and the Atlantic Ocean in the east. In exchange for this vast land grant and the exclusive trading rights tied to it, the Company was expected to bring two to three hundred settlers to New France in 1628, and a subsequent four thousand during the next fifteen years. To achieve this, the Company subinfeudated almost all of the land awarded to it by Cardinal Richelieu — that is, parceled it out into smaller units that were then run on a feudal-like basis and worked by habitants.

The lands were arranged in long narrow strips called seigneuries or fiefs along the banks of the St. Lawrence River, its estuaries, and other key transit features. This physical layout of manorial property developed as a means of maximizing ease of transit, commerce, and communication by using natural waterways (most notably, the St. Lawrence river) and the relatively few roads. A desirable plot had to be directly bordering or in very close proximity to a river system, which limited plot-expansion to one of two directions—left or right.

Despite the official arrangement reached between Cardinal Richelieu and the Company of One Hundred Associates, levels of migration to French colonies in North America remained extremely low. The resulting scarcity of labour had a profound effect on the system of land distribution and the habitant-seigneurial relationship that emerged in New France.

King Louis XIV instituted a condition on the land, stating that it could be forfeited unless it was cleared within a certain period of time. This condition kept the land from being sold by the seigneur, leading instead to its being sub-granted to peasant farmers, the habitants.

When a habitant was granted the title deed to a lot, he had to agree to accept a variety of annual charges and restrictions. Rent was the most important of these and could be set in money, produce or labour. Once this rent was set, it could not be altered, neither due to inflation nor time. A habitant was essentially free to develop his land as he wished, with only a few obligations to his seigneur. Likewise, a seigneur did not have many responsibilities towards his habitants. The seigneur was obligated to build a gristmill for his tenants, and they in turn were required to grind their grain there and provide the seigneur with one sack of flour out of every 14. The seigneur also had the right to a specific number of days of forced labour by the habitants and could claim rights over fishing, timber and common pastures.