Acanthomintha is a genus of the mint family, Lamiaceae. The genus Acanthomintha is commonly referred to as thornmint or thorn-mint. There are four species within this genus, including the endangered species Acanthomintha duttonii. All four thornmints are native to the California Floristic Province. The origin of the genus name is from the identical Greek word meaning thornmint.

The four known species of Acanthomintha are:

• Acanthomintha duttonii (Abrams) Jokerst: San Mateo thorn-mint – San Mateo County
• Acanthomintha ilicifolia A.Gray: San Diego thorn-mint, San Diego thornmint – San Diego County and northern Baja California
• Acanthomintha lanceolata Curran: Santa Clara thorn-mint – inner Coast Ranges from Alameda County to San Luis Obispo County
• Acanthomintha obovata Jepson: San Benito thorn-mint – range from Alameda County to Los Angeles County

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