HH1

HH1 or HH-1 may refer to:

Vehicular and transportation HH-1 Huey, a military helicopter PRR HH1, a steam locomotive Sindlinger Hawker Hurricane, a homebuilt aircraft HH1, a model in the series of Honda Acty trucks

Other uses Tetulomab (HH1), an experimental cancer drug HH1, one of the Hamburger–Hamilton stages in chick development HH 1/2, the first Herbig-Haro object identified On Basilisk Station, the first novel in the Honor Harrington series by David Weber, abbreviated HH1