Henry Alexander Crabb (died April 7, 1857) was an American soldier and an early member of the California State Senate, who served during a term ending in 1854.

[1] He had reportedly once lived in Mississippi and killed a Mr. Jenkins of the Vicksburg Sentinel newspaper in a duel.

[1] Crabb was an unsuccessful candidate for the United States Senate on the Know Nothing party ticket in 1857.

After losing, he organized a filibustering expedition to the Mexican state of Sonora to aid the Liberal rebels in Mexico's ongoing Reform War, specifically the leader of the Liberals in Sonora, Ignacio Pesqueira.

According to one report in a Mississippi newspaper, "his head was preserved in spirits of wine and sent to the city of Mexico.