Utricularia linearis is an affixed aquatic bladderwort endemic to the Northern Territory.
The species has a simple white flower roughly 1 cm long. The lower corolla lip flares outwards and downwards and is slightly serrated at the edge. The palate is coloured yellow or lime green. The species is notable for its long, fleshy penduncle, which raises the flower above the surface of the water. When the species blooms in shallow water, the peduncle travels along the surface of the water before turning upwards to elevate the bloom. The leaves are linear, which gives the species its name.
U. linearis grows at the shores of Melaleuca swamps in Darwin, Litchfield and Kakadu. The distribution of the species is poorly known and has only been recorded from a handful of sites.
The species is superficially similar to several white coloured bladderworts in the Top End but can be distinguished by its long, fleshy peduncle and outwards flaring lower corolla lip.