HH19, HH-19, HH 19, HH.19, may refer to:

Sikorsky HH-19, a variant of the Sikorsky H-19 Chickasaw helicopter

HH19, one of the Hamburger–Hamilton stages in chick development DUSP6, dual specificity phosphatase 6, also called "HH19"

See also

HH (disambiguation) H19 (disambiguation) H (disambiguation)