HH10, HH-10, HH 10, HH.10, may refer to:
- War of Honor (novel), abbreviated "HH10", tenth main-line novel in the Honor Harrington novel series, part of the Honorverse fictional milieu created by David Weber
- HH10, one of the Hamburger–Hamilton stages in chick development
- HH10, one of the hammerhead ribozymes
- TAC3, Tachykinin-3, also called "HH10"