O. maculata may refer to:
Oaracta maculata, a geometer moth Ocyropsis maculata, a comb jelly Odontocheilopteryx maculata, a snout moth Oeceoclades maculata, a monk orchid Oecia maculata, a long-horned moth Oedipoda maculata, a band-winged grasshopper Oligoria maculata, an American skipper Oliva maculata, a sea snail Onchidella maculata, a sea slug Ophryotrocha maculata, a ringed worm Orchis maculata, a perennial plant Orleanesia maculata, a plant native to South America Oxycera maculata, a soldier fly Oxychona maculata, a land snail Oxymeris maculata, an auger snail