HH7

HH7, HH-7, HH 7, HH.7, may refer to:


 * In Enemy Hands (novel), abbreviated "HH7", seventh main-line novel in the Honor Harrington novel series, part of the Honorverse fictional milieu created by David Weber


 * HH7, one of the Hamburger–Hamilton stages in chick development
 * GNRHR, Gonadotropin-releasing hormone receptor, also called "HH7"