Aigialosuchus is an extinct genus of long-snouted crocodylomorph that lived in what is now Sweden during the Campanian stage of the Late Cretaceous period.

The genus contains a single species, A. villandensis, described in 1959 by Per Ove Persson based on material recovered from the Kristianstad Basin in southern Sweden.

In the Cretaceous, southern Scandinavia was covered by shallow sea and the Ivö Klack site within the Kristianstad Basin, where most of the fossils referred to Aigialosuchus have been found, was a small and rocky island.

Aigialosuchus was described by Swedish paleontologist Per-Ove Persson in 1959 based on fossil material recovered at the Ivö Klack locality in the Kristianstad Basin.

The material Persson based Aigialosuchus on were the remains of the anterior part of the skull and of the mandibles, including some detached teeth, belonging to a single individual.

[3] A similar tooth also discovered in Early to Middle Paleocene deposits, this time at Gemmas Allé in Copenhagen, in 2014, also accorded well with Persson's description of Aigialosuchus teeth, though it was not referred to the genus due to the lack of a formal comparison to the type material.

[7] Another diagnostic feature is the mandibular symphysis (the connection between the left and right mandible) of Aigialosuchus being unusually long,[1] 13.8 centimetres (5.4 inches),[8] and being reached by the splenial bone.

In 2001, American paleontologist Christopher Brochu noted that Aigialosuchus was an enigmatic crocodyliform, but probably a eusuchian (the group that contains all living crocodilians).

Schwarz-Wings, Milàn and Gravesen noted that until a taxonomic revision of the Aigialosuchus material is carried out, its precise systematic position within the entire Crocodylomorpha will remain unclear.

During the Campanian, the Kristianstad Basin was a subtropical to temperate shallow inland sea home to a diverse marine fauna characteristic of shallow marine life of an inner shelf community and included abundant algae, brachiopods, bryozoans, molluscs (including bivalves, gastropods, belemnites and the ammonites), sea urchins, serpulids, decapods and sponges.