Alexandre Maître, Marquis de Bay (1650 – 14 November 1715) was a French military officer in the service of Spain during the War of the Spanish Succession. Born in Salins in 1650, Maître married Cécile de Winssinkercke, who had been born in Louvain on 7 September 1670. Maître was the seigneur of Laer, near Tirlemont. Between 1696 and 1701 he volunteered his service as a cavalry colonel with the Dutch Republic. In 1701 he offered his services to Philip V of Spain, and became general of cavalry serving in Flanders. He distinguished himself in the War of Spanish Succession, especially during the Battle of Ekeren on 30 June 1703, fighting alongside the duc de Villeroy, at the head of the cavalry and the dragoons.