P. americanus may refer to:
- Parus americanus, a bird species in the genus Parus
- Polyprion americanus, a wreckfish species
- Potamogeton americanus, a pondweed species in the genus Potamogeton
- Protomognathus americanus, an insect species
- Pseudopleuronectes americanus, a flounder species
See also
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