PH-1

PH-1, PH 1, PH.1, PH1 or variant, may refer to:


 * PH1 (star system) (Planet Hunters 1), the first system with a planet (PH1b - Planet Hunters 1 b) discovered by Planet Hunters; the star system also called KIC 4862625 or Kepler-64
 * Hall PH-1, a model of the Hall PH airplane
 * PH1, a postcode in the PH postcode area of the United Kingdom
 * PH1, IAU Minor Planet Center nomenclature for naming asteroids
 * 1988 PH1, see 4768 Hartley
 * 1991 PH1
 * 1992 PH1, see 12320 Loschmidt
 * 1994 PH1, see (9391) 1994 PH1
 * 1999 PH1, see 19617 Duhamel
 * pH-1 (rapper), a South Korean rapper
 * PH-1, the official codename for the Essential Phone, Andy Rubin's first-generation Android device