HH6

HH6, HH-6, HH 6, HH.6, may refer to:


 * Honor Among Enemies (novel), abbreviated "HH6", sixth main-line novel in the Honor Harrington novel series, part of the Honorverse fictional milieu created by David Weber


 * Fibroblast growth factor 8 (HH6)
 * HH6, one of the Hamburger–Hamilton stages in chick development
 * FWD HH6, an interwar U.S. military truck; see List of military trucks
 * HH6, a model in the series of Honda Acty trucks