Centaurea alba is a species of Centaurea found in the Iberian Peninsula in southern and central Spain and in a small neighbouring area in the interior of Portugal. There are three recognised subspecies, and of one subspecies, the nominate, there are furthermore three varieties.

It has been called pale knapweed in English. Vernacular names which have been recorded for this herb in Castilian Spanish are calcitrapa, cardo estrellado, centaura estrellada, garbanzos del cura, siempre nueva, siempre-nueva, and trapacaballos. Other local recorded names in Spanish are abreojos, abrepuños, amargosa, amargosilla, amargoso, ardolla, arzolla, cardo abrepuños, cardo de la arzolla, marbosilla, margosilla, piropo, planta para hemorroides and raíz de la arzolla. In the Catalan language it is known as raspallera in the Valencian dialect.

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