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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