Paracapillaria is a genus of parasitic nematodes. Species of the genus Paracapillaria parasitise fishes and amphibians, reptiles (snakes), and a single species, Paracapillaria philippinensis <small>(Chitwood, Velasquez & Salazar, 1968)</small> (often referred to as Capillaria philippinensis), is known from birds and mammals including man.
There are about a dozen species parasites in fish, such as Paracapillaria rhamdiae <small>Moravec, González-SolÃÂs & Vargas-Vásquez, 1995</small>. or Paracapillaria gastrica <small>Moravec & Justine, 2020</small>