Dirina pacifica is a species of saxicolous (rock-dwelling), crustose lichen in the family Roccellaceae.

The lichen was formally described as a new species in 2013 by Anders Tehler and Damien Ertz.

It has a creamy white to greyish or brownish thallus (0.1–0.3 mm thick) lacking pruina, and a chalk-like medulla.

Its ascomata have a circular outline up to 1.5 mm in diameter, with a whitish-grey disc.

Dirina pacifica contains the lichen products erythrin, lecanoric acid, and sometimes three unidentified substances named "C", "F", and "G".