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)
See also
HH (disambiguation) H13 (disambiguation) H (disambiguation)