P. olivaceus may refer to:
- Panaeolus olivaceus, a mushroom species
- Paralichthys olivaceus, the olive flounder, a flatfish species
- Phylloscopus olivaceus, the Philippine leaf warbler, a bird species
- Picumnus olivaceus, the olivaceous piculet, a bird species
- Prionochilus olivaceus, the olive-backed flowerpecker, a bird species
- Pristimantis olivaceus, a frog species
- Psophodes olivaceus, the eastern whipbird, a bird species
This disambiguation page lists articles associated with the same abbreviated species scientific name.
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