Waterbug or water bug can refer to any of several things:

True bugs The true water bugs (Nepomorpha), including such insects as giant water bugs (Belostomatidae), creeping water bugs (Naucoridae) and backswimmers (Notonectidae) Various other aquatic true bugs (Hemiptera), known collectively as water bugs (Heteroptera)

Cockroaches The American cockroach, Periplaneta americana The German cockroach, Blattella germanica The Oriental cockroach, Blatta orientalis

See also Waterbug Records, a record label