Look up phosphorus in Wiktionary, the free dictionary.
Phosphorus is a chemical element with symbol P and atomic number 15.
Phosphorus may also refer to:
- Phosphorus (morning star), the Morning Star, the planet Venus in its morning appearance
- Phosphorus (horse)
- Phosphorus (beetle), a genus of longhorn beetles
- Phosphorus (Thrace), a town of ancient Thrace, now in Turkey
- Phosphorus, an Iranian Cybercrime group