H0 (H followed by zero), H0, or H00 may refer to:
HO scale, used in rail transport modelling Higgs boson, in physics, symbol H0 Hammett acidity function, in chemistry, H0 Hubble constant, in cosmology, H0 Null hypothesis, in statistics, often denoted H0 , a British and later Canadian warship Stye, a bacterial infection of the eyelid, ICD-10 code H00
See also 0H (disambiguation) Ho (disambiguation)