Physetica caerulea is a species of moth of the family Noctuidae. It is endemic to New Zealand and can be found from the centre of the North Island south, including the South and Stewart Islands. The adult moths are variable in appearance but can be distinguished by the bluish tinge to the forewings as well as the underside buff colour. However this species does have several forms including a very dark bluish black form, a brownish form and a green-brown form. It lives in open habitats and can be found in tussock grasslands and dunes and can normally be found from altitudes of sea level up to 900 m. Adults of this species are on the wing from August to April. As at 2017, the life history of is unknown as are the host species of its larvae. However it has been hypothesised that the larval host species is a tomentose plant.

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