Equine alphaherpesvirus 9 (EHV-9) is a species of virus in the genus Varicellovirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.

[1] It was first isolated from a case of epizootic encephalitis in a herd of Thomson's gazelle (Gazella thomsoni) in 1993.

Fatal encephalitis was reported from Thomson's gazelle, giraffe, and polar bear[2] in natural infections.

The virus was reported in an aborted Persian onager and a polar bear.

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