Gambierdiscus pacificus is a species of toxic (ciguatoxin- and maitotoxin-like toxicity) dinoflagellate.

It is 67–77 μm long and 60–76 μm wide dorsoventrally and its surface is smooth.

It is identified by a four-sided apical pore plate surrounded by 30 round pores.

Its first plate occupies 20% of the width of the hypotheca.

This dinoflagellate-related article is a stub.