The Alto Velo Claim, also referred to as the Alta Vela Affair, was a territorial claim against the Dominican government by American adventurers ejected from Alto Velo Island by Dominican officials in October 1860. In all, three companies claimed U.S. protection of their right to mine guano from the island under the Guano Islands Act of 1856, but the U.S. Department of State never recognized U.S. interests in the island.