Porta San Donato, also known as Porta Zamboni, was a gate or portal of the former outer medieval walls of the city of Bologna, Italy. It was a gate into the university area of the city.
The gate was built in the 13th century, and by 1354 was equipped with a drawbridge. It was sealed in 1428, but reopened in the following decades. It is flanked by a machiocolated tower.