HH19

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"