ph2, ph-2, ph.2 or variant, may refer to:
- AMD Phenom II CPU chip
- PH2 (Planet Hunters 2), star system with a planet
- PH2 b, a planet around that star
- 1991 PH2 or 9341 Gracekelly
- 1992 PH2 or (13089) 1992 PH2
- Hall PH-2, biplane flying boat
- Pander PH.2 Mayer, see List of aircraft (P)
- biphenyl, Ph2 or Ph-Ph
- Phenolphthalein, ph2 or phph
- PH2, a postcode in Perth, Scotland, see PH postcode area
- PH2− the phosphanide ion in inorganic chemistry
- -PH2 the phosphanyl group in organic chemistry
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