Turgidodon is an extinct genus of alphadontid marsupial from the Late Cretaceous of western North America.

[1] The genus was named in 1990 by Richard L. Cifelli for species that had previously been described as members of Alphadon, with the name after the Latin word Turgidus: "swollen".

The type species is T. praesagus, first named in 1952 by Russell as a species of Delphodon for a tooth from the Oldman Formation of Alberta.

As well, Turgidodon includes T. rhaister, named in 1966 by Clemens as a species of Alphadon from the Lance Formation, T. russelli, named in 1979 by Fox as a species of Alphadon also from the Oldman Formation, T. parapraesagus, named in 1987 by Rigby and Wolfberg as a species of Alphadon from the Forest Fauna, and two species named in 1990 by Cifelli: T. lillegraveni and T. madseni.

Both T. lillengraveni and T. madseni are from the Kaiparowits Formation of Utah, and named after paleontologists important to the studies of early mammals.