Ophiusa tirhaca, the green drab, is a moth of the family Erebidae. The species was first described by Pieter Cramer in 1777. It is found in southern Europe, Africa, Australia and the southern parts of Asia.

The wingspan is about 50 mm.

The larvae feed on heath, Pistacia lentiscus, Pistacia terebinthus, Cotinus coggygria, Rhus coriaria, Rhus cotinus, Cistus, Eucalyptus, Osyris, Viburnum and Pelargonium.

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