Grammatorcynus is a genus of ray-finned bony fish in the family Scombridae. This genus together with Acanthocybium and Scomberomorus are comprised by the tribe Scomberomorini, commonly known as the Spanish mackerels or seerfishes. Grammatorcynus comprises two species: \n* Grammatorcynus bicarinatus (Quoy & Gaimard, 1825), shark mackerel \n* Grammatorcynus bilineatus (Rüppell, 1836), double-lined mackerel