Montoir-de-Bretagne (French pronunciation: [mɔ̃twaʁ də bʁətaɲ] ⓘ, literally Montoir of Brittany; Gallo: Montoér or Montouèrr, Breton: Mouster-al-Loc'h) is a commune in the Loire-Atlantique department in western France.

The population data given in the table below refer to the commune of Montoir-de-Bretagne in its geography at the given years.

In 1913 the commune of Trignac was created from part of Montoir-de-Bretagne, in 1925 Saint-Malo-de-Guersac was created from part of Montoir-de-Bretagne.

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