HH13

HH13, HH-13, HH 13, HH.13, may refer to:


 * A Rising Thunder (novel), abbreviated "HH13", 13th main-line novel in the Honor Harrington novel series, part of the Honorverse fictional milieu created by David Weber


 * HH13, one of the Hamburger–Hamilton stages in chick development
 * PTP4A2, protein tyrosine phosphatase type IVA 2, also called "HH13"
 * Kisspeptin (HH13)