Heliconius antiochus, the Antiochus Longwing, is a butterfly of the Nymphalidae family. It was described by Linnaeus in 1767. It is found from Panama to the Amazon region. The habitat consists of riparian forests. Adults have blue-black wings with two transverse white or yellow bands on the distal part of the forewings. They are a Müllerian mimic of Heliconius wallacei, Heliconius sara and Heliconius congener. The larvae are gregarious and mostly feed on Passiflora species from the subgenus Astrophea. Full-grown larvae have a yellow body with a black head and reach a length of about 12 mm.