Guraleus janjukiensis is an extinct species of sea snail, a marine gastropod mollusc, in the family Mangeliidae. Fossils of the species date to early Miocene strata of the Port Phillip Basin of Victoria, Australia.
In the original description, Powell described the species as follows:
The holotype of the species measures in length and has a diameter of .
The species was first described by A. W. B. Powell in 1944. The holotype was collected at an unknown date prior to 1945 from Torquay, Victoria, and is held in the collections of Auckland War Memorial Museum.
This extinct marine species occurs in early Miocene strata of the Port Phillip Basin of Victoria, Australia, including the Puebla Formation.