Giovanni Mario Alessandri was an Italian Hispanist and grammarian from the 16th century.
He spent a time at the Spanish royal court and he wrote the first Spanish grammar for Italians, Il Paragone della Lingua Toscana et Castigliana (Nápoles: Mattia Cancer, 1560).[1] There he is particularly careful with phonetics. This work was inspirational for Giovanni Miranda's Osservationi de la lingua castigliana.