HH1

HH1 or HH-1 may refer to:

Vehicular and transportation

 * HH-1 Huey, a military helicopter
 * PRR HH1, a steam locomotive
 * Sindlinger HH-1 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, the first Herbig-Haro object identified
 * On Basilisk Station (novel), abbreviated "HH1", first main-line novel in the Honor Harrington novel series, part of the Honorverse fictional milieu created by David Weber