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Alessandro Costantini (ca. 1581–1583, Staffolo – 20 October 1657, Rome) was an Italian baroque composer, maestro di cappella at the Collegium Germanicum.
Bishop von Stahl took an interest in him, and in 1844 sent him to the Collegium Germanicum at Rome, whither he had already sent Heinrich Joseph Dominicus Denzinger and Franz Hettinger.