P. maxima may refer to:
Paracrocidura maxima, an African mammal Pectinodonta maxima, a true limpet Phyllosticta maxima, a plant pathogen Pinctada maxima, a pearl oyster Pisulina maxima, a cave snail Pitta maxima, a bird endemic to North Maluku Pollex maxima, an Indonesian moth Premna maxima, a plant endemic to Kenya Problepsis maxima, a Japanese moth Psetta maxima, a demersal fish Pseudoeurycea maxima, a salamander endemic to Mexico Purlovia maxima, a therocephalian therapsid