Hvítserkur (Icelandic pronunciation: [ˈkʰvitˌsɛr̥kʏr̥], regionally also [-ˌsɛrkʰʏr̥]) is a 15 m high basalt stack along the eastern shore of the Vatnsnes peninsula, in northwest Iceland.

[1] The rock has two holes at the base, which give it the appearance of a dragon that is drinking.

The base of the stack has been reinforced with concrete to protect its foundations from the sea.

[2] Several species of birds, such as gulls and fulmars, live at Hvítserkur and its name ('white shirt' in Icelandic) comes from the color of the guano deposited on its rocks.