Hydra Cove is a small cove indenting for 200 m the northwest coast of Varna Peninsula, Livingston Island in the South Shetland Islands, Antarctica and entered north of Gargoyle Bastion.
The feature is named after the Lernaean Hydra, a monster with nine heads slain by Hercules.
The cove is centred at 62°27′54″S 60°08′15″W / 62.46500°S 60.13750°W which is 17.7 km northeast of Siddins Point and 1.42 km south of Williams Point (British mapping in 1968, and Bulgarian mapping in 2005 and 2009).