Rosario Gagliardi (1698–1762) was an Italian architect born in Syracuse.
He worked mostly in the Sicilian Baroque beginning with the cathedral at Modica in 1702.
When evaluating his work at San Giorgio in Modica, and the domed Basilica of San Giorgio in Ragusa (designed 1738, built 1744–66), it appears incredible that he was completely untravelled.
As the Sicilian baroque style evolved so too did the accomplishment of his work.
Gagliardi was also responsible for numerous other churches and palazzi in Noto and other places on the island.