Alessandro Costantini (c. 1581–1583 in Staffolo – 20 October 1657 in Rome) was an Italian baroque composer, maestro di cappella at the Collegium Germanicum.
His surviving works include several Latin motets.
[1] He and his brother, the composer Fabio Costantini [it], were pupils of Giovanni Bernardino Nanino.
His brother-in-law was the countertenor Domenico Albrici [it], whose sons, the composers Vincenzo Albrici and Bartolomeo Albrici [it], were his nephews.
This article about an Italian composer is a stub.