Hydrogen deuteride
Properties
Molecular formula	HD
Molar mass	3.02 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references

Hydrogen deuteride is a bi-atomic substance of the two isotopes of hydrogen: the majority isotope ¹H protium and ²H deuterium. Its molecular formula is HD. Hydrogen deuteride is a minor component of naturally occurring molecular hydrogen. In particular it is one of the minor but noticeble components of the atmospheres of all the giant planets, with abundances from about 30 to about 200 ppm.

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