HP4

HP4 or variant, may refer to:


 * HP4, a postcode for Berkhamsted, see HP postcode area
 * hP4, a Pearson symbol
 * Harry Potter and the Goblet of Fire, the fourth Harry Potter novel
 * Harry Potter and the Goblet of Fire (film), the fourth Harry Potter film
 * Handley Page Type D a.k.a. H.P.4, an airplane
 * HP-4, a glider designed by Richard Schreder
 * HP4, a type of photographic stock, see Ilford HP
 * HP4, a version of the BMW S1000RR produced between 2013 and 2014.