Datana major, the major datana or azalea caterpillar, is a moth of the family Notodontidae. It is found from Maryland to Florida, west to Kansas and Arkansas.

Datana major
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Notodontidae
Genus: Datana
Species:
D. major
Binomial name
Datana major
Grote & Robinson, 1866

The wingspan is 40–50 mm. Adults are on wing from June to August. Normally, there is one generation per year, although there may be a partial second generation in the southern part of the range.

The larvae mainly feed on Rhododendron and Andromeda polifolia.

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