| Conventional Long Name: | Domaine du roy |
| Common Name: | Domaine Du Roy |
| Nation: | New France |
| Image Map Caption: | Domaine du Roy, 1731 |
| Capital: | Quebec |
| S2: | Province of Quebec (1763–1791) |
| Flag S2: | Flag of Great Britain (1707-1800).svg |
| Year Start: | 1652 |
| Event End: | Ceded to Britain |
| Year End: | 1763 |
| Date End: | 10 February |
The Domaine du roy ("King's Domain") was a vast region of New France extending north from the shore of the Saint Lawrence River between the seigneurie of Les Éboulements (near the City of Quebec) and Cape Cormorant (near the present-day town Lourdes) towards the Hudson Bay watershed, an area claimed by Great Britain as Rupert's Land, the territory covered an area of 460,000 km2.
Established in 1652, the Domaine du roy was renamed "King's Domain" after the French and Indian War.[1] A present-day regional county municipality in the Saguenay–Lac-Saint-Jean region of Quebec also inherited the name Le Domaine-du-Roy.