Heliconius doris, the Doris longwing or Doris is a species of butterfly in the family Nymphalidae. It is known for being a polymorphic species which participates in various Müllerian mimicry rings throughout Central America and the Amazon rainforest. It is a species of special interest in biological science for the genetic basis and role of polymorphism (biology) in ecology and evolution.

It is commonly found from sea level to 1200 metres in forest clearings.

The larvae primarily feed on granadilla species. Adults feed on nectar from Lantana flowers, with the females also collecting pollen from Psiguria and Psychotia flowers.

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