Alessandro Marchetti (16 June 1884 – 5 December 1966) was an Italian engineer and airplane designer.

For the Vikers he designed a very fast small biplane known as the Marchetti MVT (Marchetti-Vickers-Terni).

[1] In 1922, he joined the SIAI (Società Idrovolanti Alta Italia) as technical director and in the period between the world wars designed a series of seaplanes of technical originality and commercial success.

Unlike previous flying boats with a central hull like the Dorniers or with two floats, he designed a craft with twin hulls set beneath a single large wing of considerable thickness, making it possible to eliminate the bracing.

Marchetti went on to produce the planes that Francesco de Pinedo flew around the world, and Arturo Ferrarin made a non-stop flight from Italy to Brazil.