Chromium(I) hydride, systematically named chromium hydride, is an inorganic compound with the chemical formula (CrH)n (also written as ([CrH])n or CrH). It occurs naturally in some kinds of stars where it has been detected by its spectrum. However, molecular chromium(I) hydride with the formula CrH has been isolated in solid gas matrices. The molecular hydride is very reactive. As such the compound is not well characterised, although many of its properties have been calculated via computational chemistry.