[1] Gigantopecten is a genus of fossil scallops, marine bivalve molluscs in the family Pectinidae, the scallops.

[2] These facultatively mobile low-level epifaunal suspension feeders lived from the Oligocene to the Quaternary period (from 33.9 to 0.781 Ma).

[3] Species within the genus Gigantopecten include:[3][4] Species within this genus have a very large shells, reaching a height of about 134 millimetres (5.3 in) and a length of about 167 millimetres (6.6 in).

The left valve is slightly more convex than the right one.

[6] Fossils of species within this genus have been found in the sediments of the United States, Italy, Algeria, Austria, Cuba, France, Haiti, Hungary, Poland, Slovakia and Iran.