Arenaria, a Latin word meaning sand-loving (or psammophilic), may refer to:
Genera Arenaria (bird), the turnstones, a bird genus of the family Scolopacidae Arenaria (plant), the sandworts, a plant genus of the family Caryophyllaceae
Species Phengaris alcon arenaria, the Dutch alcon blue, an extinct subspecies of the alcon blue butterfly that was endemic to the Netherlands Meloidogyne arenaria thamesi, a synonym for Meloidogyne thamesi, the Thames' root-knot nematode, a plant-pathogenic nematode species
See also Arenarium Arenarius (disambiguation)