P. exigua may refer to:
Partula exigua, an extinct snail Parvocaulis exigua, a green algae Parvulastra exigua, a sea star Patella exigua, a true limpet Pelegrina exigua, a jumping spider Peperomia exigua, a radiator plant Perigona exigua, a ground beetle Phaneroptera exigua, an Old World katydid Phasmoneura exigua, a carnivorous insect Philine exigua, a headshield slug Phoma exigua, a plant pathogen Phorocera exigua, a tachina fly Phycolepidozia exigua, a liverwort endemic to Dominica Phyllosticta exigua, a sac fungus Plagiolepis exigua, a formic-acid-producing ant Platythyrea exigua, a predaceous ant Plecopterodes exigua, an Afrotropical moth Pleurothallis exigua, a bonnet orchid Ponometia exigua, an American moth Prenanthella exigua, a flowering plant Prumnopitys exigua, a Bolivian conifer Pseudopoda exigua, a huntsman spider Psilogramma exigua, a hawk moth Purpurcapsula exigua, a false cowry Puya exigua, a plant endemic to Ecuador