P. olivaceus
# P. olivaceus

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
