The Grand West is a geographical concept often used in France to indicate the areas of the west of the country. Although not clearly delimited and corresponding to no administrative entity, it in general gathers the Brittany, the Basse-Normandie and the Pays of the Loire. The areas Poitou-Charentes or more rarely High-Normandy are sometimes included there.

This name is thus often attached to achievements or equipment common to these various areas (for example Canceropole Grand Western) or for the diagrams of transport (highways, railway lines at high speed)

At the time of the European elections of 2004 in France, an electoral constituency " Ouest" , sometimes improperly called " Large-Ouest" gathered the Brittany areas, Pays of the Loire and Poitou-Charentes. The Lower Normandy, it, was attached to a district " North-ouest" (with High-Normandy, the Nord-Pas-de-Calais and Picardy).