Astrophytum capricorne, the goat's horn cactus, is a species of flowering plant in the cactus family Cactaceae, that is native to the Coahuila regions of Northern Mexico. Growing to 50 centimetres (20 in) tall by 10 centimetres (3.9 in) wide in a ball or oval shape, it is grey-green in colour with 7 to 9 prominent ribs, very long twisted spines and yellow flowers with a red centre in summer.

The common name of goat's horn cactus corresponds to the species identifier capricorne (capri meaning "goat" and corne meaning "horn") referring to the curved spines that are said to resemble a goat's horns.

This species is designated as of "least concern" by the IUCN as it is widely distributed in the Chihuahuan desert.

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