H0

H0 (H followed by zero) or H00 may refer to:


 * H0 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
 * HMS Comet (H00), a British and later Canadian warship
 * Stye, a bacterial infection of the eyelid, ICD-10 code H00