Dalloyau (French pronunciation: [dalwajo]) is a Paris-based food company founded in 1682.

Dalloyau and his brothers worked for the Court as "Officiers de bouche", the highest French gastronomy distinction at the time.

It is his spouse, Andrée Gavillon, that named it "Opéra" in tribute to the auditorium of the Palais Garnier.

The Opera is a rectangular cake composed of three thin layers of almond sponge cake soaked in coffee syrup alternating between layers of coffee butter cream and chocolate glaze topped with ganache.

Since 2018, Dalloyau runs a network of franchises with 28 stores and corners abroad: twenty in Japan, four in Hong Kong,[4] three in South Korea, two in Dubai, and two in Baku.