Saint Adalbert Basilica, is a historic Roman Catholic church located on Buffalo, New York's East Side within the Diocese of Buffalo. It is a prime example of the Polish Cathedral style of church architecture in both its opulence and grand scale. A rare and special designation bestowed on the parish occurred in 1907, when the Vatican proclaimed St. Adalbert a basilica, the first in the USA. The proclamation, as well as its English translation, can be viewed to this day in the basilica's museum room.

The Polish cathedral architectural style is a North American genre of Catholic church architecture found throughout the Great Lakes and Middle Atlantic regions as well as in parts of New England. These monumentally grand churches are not necessarily cathedrals, defined as seats of bishops or of their dioceses.