The Florianópolis Formation (Portuguese: Formacão Florianópolis) is a geological formation of the Santos Basin offshore of the Brazilian states of Rio de Janeiro, São Paulo, Paraná and Santa Catarina.

The predominantly sandstone formation with interbedded shales and siltstones dates to the Early Cretaceous period; Albian epoch and has a thickness in the type oil well of 343 metres (1,125 ft).

The Florianópolis Formation is 343 metres (1,125 ft) thick in the type oil well, and consists of reddish, fine to coarse-grained sandstones with a clay matrix, reddish micaceous shales and siltstones.

These clastic units are thought to represent alluvial environments distributed along the western Brazilian basin margin, along the Santos Hinge Line.

Biostratigraphical data and its relations with the Guarujá Formation point towards an Albian age.