The patroness of Diano Marina is Our Lady of Mount Carmel, celebrated on 16 July.
According to some sources, the area's earliest Christian instruction took place around the 1st century through Saints Nazarius and Celsus, to whom the people of Diano later dedicated a small church near today's sports ground: the building, now deconsecrated, stands in the archaeological area of Prato Fiorito, where the Roman settlements of ancient Lucus Bormani were found, and was built over other Roman-era structures. The parish church of Sant'Antonio, on the town's seafront, was instead rebuilt between 1862 and 1865.
The earthquake and subsequent tsunami of 23 February 1887 caused considerable structural damage to the town's houses and artistic monuments, as well as the loss of some lives: the design of the new town plan and the new urban layout that shaped the town in the following years is credited to the Piedmontese engineer Giacomo Pisani. Diano Marina is also known today for the Corpus Domini Infiorata, first held in 1963, and for the Carnevale Dianese, which since 1969 has enlivened the town's streets with allegorical floats and folk groups led by the Famìa Dianese.
