The short-snouted seahorse (Hippocampus hippocampus) is a species of seahorse in the family Syngnathidae. It is endemic to the Mediterranean Sea and parts of the North Atlantic, particularly around Italy and the Canary Islands. Colonies of the species have recently been discovered in the River Thames around London and Southend-on-Sea. Their preferred habitat is shallow muddy waters, estuaries or seagrass beds.