A. horridus

A. horridus may refer to:


 * Abdopus horridus, an octopus species in the genus Abdopus
 * Acanthopholis horridus, an ankylosaurid dinosaur species that lived during the Early Cretaceous Period around 100 million years ago
 * Acanthosicyos horridus, an unusual melon species found only in Namibia
 * Argosarchus horridus, the New Zealand giant stick insect, a stick insect species endemic to New Zealand