Olgaea is a genus of Asian plants in the tribe Cardueae within the family Asteraceae, having a typical thistle appearance.

[1][2][3] In 1922, Modest Mikhaĭlovich Iljin (from the Botanical Garden of the Academy of Sciences of Soviet Russia) named the genus in honour of Russian botanist Olga Fedtschenko (1845–1921).

[4] Olgaea's genome consists of a diploid number of 2n=26 chromosomes.

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