Weevers (or Weeverfish) are nine extant species of fish of family Trachinidae, order Perciformes. They are long (up to 37 cm), mainly brown and have poisonous spines on their first dorsal fin and gills. During the day, weevers bury themselves in sand, just showing their eyes, and snatch prey as it comes past, which consists of shrimps and small fish. Weevers are unusual in not having a swim bladder as do most bony fishes and as a result sink as soon as they stop actively swimming. With the exception of T. cornutus from the south-east Pacific, all species in this family are restricted to the eastern Atlantic (including the Mediterranean). A tenth, extinct species, Callipterus speciosus, is known from the Monte Bolca lagerstatte of the Lutetian epoch.

Weevers are sometimes used as an ingredient in the recipe for bouillabaisse.^{[citation needed]}

Weevers are sometimes erroneously called 'weaver fish', although the word is unrelated. In fact, the word 'weever' is believed to derive from the Old French word 'wivre', meaning serpent or dragon, from the Latin 'vipera'. It is sometimes also known as the viperfish, although it is not related to the viperfish proper (i.e., the stomiids of the genus Chauliodus).