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.

See also HP (disambiguation)