
Akerbeltz or Aker is a spirit in the folk mythology of the Basque people. It is said to live inside the land and is believed to have as many elves as servants. In Christianity, Akerbeltz is considered the live image of the devil, performing sexual abuses against members of Christian covens.

In Basque mythology, Basajaun is a huge, hairy hominid dwelling in the woods. They were thought to build megaliths, protect flocks of livestock, and teach skills such as agriculture and ironworking to humans.

The fish-man of Liérganes, is an entity which belongs to the mythology of Cantabria, located in the north of Spain. The fish-man of Liérganes would be an amphibian human-looking being, that looked a lot like a metamorphosis of a real human being who was lost at sea. His story was examined by the Enlightenment writer Benito Jerónimo Feijoo, who claimed that the story of the fish-man of Liérganes was true.

The jentil, are a race of giants in the Basque mythology. This word meaning gentile, from Latin gentilis, was used to refer to pre-Christian civilizations and in particular to the builders of megalithic monuments, to which the other Basque mythical legend the Mairuak are involved too.
The lamia or lamina is a siren- or nereid-like creature in Basque mythology. Lamiak, laminak or amilamiak are typically portrayed as living in and around rivers. They are depicted as being very beautiful, are said to often stay at the river shore combing their long hair with a golden comb and are involved with tales where they easily charm men. They are also characterised as having duck feet.
Olentzero is a character in Basque Christmas tradition. According to Basque traditions, Olentzero comes to town late at night on the 24th of December to drop off presents for children. In some places he arrives later, for example in Ochagavía – Otsagabia on the 27th and in Ermua on the 31st.

In Basque mythology, Sugaar is the male half of a pre-Christian Basque deity associated with storms and thunder. He is normally imagined as a dragon or serpent. Unlike his female consort, Mari, there are very few remaining legends about Sugaar. The basic purpose of his existence is to periodically join with Mari in the mountains to generate the storms.

Tartaro, Tartalo, or Torto in Basque mythology, is an enormously strong one-eyed giant very similar to the Greek Cyclops that Ulysses faced in Homer's Odyssey. He is said to live in caves in the mountains and catches young people in order to eat them; in some accounts he eats sheep also.