Pentachaeta is a genus of the family Asteraceae; the entire genus is endemic to California. Of the six species members, at least one, Pentachaeta bellidiflora, is classified as an endangered species. The etymology of the genus name derives from Greek penta, meaning five, and chaeta, meaning bristle, referring to the pappus scales of P. aurea. It was combined in Chaetopappa, but later work led to the genus being recognized as definitely separate. It is most closely related to Rigiopappus and Tracyina. Pygmydaisy is a common name for Pentachaeta.

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