Pomacea maculata is a species of large freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails.

The common name of its synonymous name Pomacea insularum is the island apple snail.

Together with Pomacea canaliculata it is the most invasive species of the family Ampullariidae. It is considered as about the 58th worst alien species in Europe.

The indigenous distribution of Pomacea maculata is South America. Pomacea maculata is reported from Argentina, Brazil, and Bolivia and it probably occurs in Uruguay and Paraguay.

The type locality is the Río Paraná, which joins the Río Uruguay just above Buenos Aires, forming the Río de la Plata. The area between the Paraná and the Uruguay is the Argentine province of Entre Ríos, the southern part of which is marshy, with channels connecting the Paraná and the Uruguay.

The initial introductions in the United States were probably from aquarium release, aka "aquarium dumping", in Texas and Florida most likely in the early 1990s, but possibly as late as 2002. Since then, it has rapidly spread from its initial introduced populations in Texas and Florida, and Pomacea maculata has been documented throughout at least 10 different states as of 2024:

Established populations exist in Florida, Georgia, and Texas.

In Florida, Georgia, and Texas, initially the occurrences of Pomacea maculata were incorrectly identified as Pomacea canaliculata. Subsequent genetic testing identified the specimens collected in Florida, Georgia, and Texas as Pomacea maculata.