Megalosauroidea (meaning 'great/big lizard forms') is a superfamily (or clade) of tetanuran theropod dinosaurs that lived from the Middle Jurassic to the Late Cretaceous period.

The group is defined as Megalosaurus bucklandii and all taxa sharing a more recent common ancestor with it than with Allosaurus fragilis or Passer domesticus.

The ICZN holds that even clade names (which do not yet have any governing body) should be replaced if having a traditional taxon suffix and being synonyms of ranked taxa at or below the superfamily level.

[3] Xuanhanosaurus Marshosaurus Condorraptor Piatnitzkysaurus Chuandongocoelurus Monolophosaurus Baryonyx Suchomimus Irritator Spinosaurus Eustreptospondylus Magnosaurus Streptospondylus Duriavenator Afrovenator Dubreuillosaurus Megalosaurus Torvosaurus Carrano, Benson & Sampson (2012) performed much larger phylogenetic analysis of the Tetanurae that includes more taxa.

They used the clade name Megalosauria (Bonaparte, 1850) in their analysis and defined it as the node comprising Megalosaurus, Spinosaurus, their most recent common ancestor, and all its descendants.

[4] Cryolophosaurus "Dilophosaurus" sinensis Chuandongocoelurus Monolophosaurus Allosauroidea Lourinhanosaurus Other coelurosaurians Marshosaurus Condorraptor Piatnitzkysaurus Streptospondylus Baryonyx Suchomimus Angaturama Irritator Spinosaurus Eustreptospondylus Duriavenator Megalosaurus Torvosaurus Afrovenator Dubreuillosaurus Magnosaurus Leshansaurus Piveteausaurus In 2019, Rauhut and Pol described Asfaltovenator vialidadi, a basal allosauroid displaying a mosaic of primitive and derived features seen within Tetanurae.