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HP1 or variant, may refer to:
- Heterochromatin Protein 1, an important marker molecule in epigenetic research
- The postal code for part of Hemel Hempstead in Dacorum, see HP postcode area
- hP1, a Pearson symbol
- Harry Potter and the Philosopher's Stone, the first novel in J.K. Rowling's Harry Potter series
- Harry Potter and the Philosopher's Stone (film), the first film in J.K. Rowling's Harry Potter series
- Handley Page Type A aka H.P.1, an airplane
- HP-1, a glider designed by Richard Schreder
- HP1, a type of photographic stock, see Ilford HP
- Haemophilus phage HP1, a virus
- Hp.1 (proceed), from German railway signalling
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