Marie-Robert Altmayer (1875–1959) was a French army corps general.
He was retired on 30 July 1937 then re-mobilised on 21 May 1940 on the orders of general Maxime Weygand.
On 24 May he was put in command of 10th Army, with which he tried to hold a front along the river Seine until 14 June, when he shifted to delaying tactics as far as the river Loire.
He did not receive his final orders to build a "Breton redoubt" behind a defence line between Saint-Malo and Saint-Nazaire as envisaged by Paul Reynaud and was captured on 19 June.
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