Utricularia laxa is a small to medium-sized annual carnivorous plant that belongs to the genus Utricularia. It is endemic to South America and is found in Argentina, Brazil, Paraguay and Uruguay. The Utricularia laxa grows as a terrestrial plant in wet grasslands and at the margins of pools, usually at elevations from near sea level to . It was originally described and published by Augustin Saint-Hilaire and Frédéric de Girard in 1838.