Charaxes barnsi is a butterfly in the family Nymphalidae. It is found on the island of Príncipe. The species was named by James John Joicey and George Talbot in 1927.

Charaxes barnsi is a large butterfly with a brown ground colour and a very wide metallic blue band punctuated by light blue (tinged violet).The male is a little smaller than the female which reaches 105 mm. It is considered part of the Charaxes tiridates group.

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