Sami beliefs about nature spirits are rooted in the indigenous shamanistic and animistic worldview of the Sami people, who have inhabited the Arctic regions of Norway, Sweden, Finland, and the Kola Peninsula of Russia for thousands of years. In Sami cosmology, every natural element—mountains, lakes, forests, rocks, and even certain animals—is believed to be inhabited by a spirit. These spirits are not merely symbolic; they are considered living, conscious entities that must be respected, appeased, and communicated with through rituals, offerings, and the guidance of a shaman known as a Noaidi. Central to these beliefs are sacred stones called Sieidi, which serve as portals or dwelling places for spirits and are treated with immense reverence. The Sami viewed the natural world as an interconnected web of spiritual forces, where harmony between humans and nature spirits was essential for survival, successful hunts, healthy reindeer herds, and overall well-being.

• Ancestral Animism: Sami spirituality is fundamentally animistic, asserting that all natural objects and phenomena possess a distinct spiritual essence or soul.
• Sieidi (Sacred Stones): These are the most important physical focal points of Sami spirit worship. Offerings of food, metal, and other valuables were traditionally left at sieidi sites to gain favor from the resident spirits.
• The Noaidi (Shaman): The Noaidi acted as an intermediary between the human world and the spirit world. Using a sacred drum, chants, and trance states, the Noaidi communicated with nature spirits to seek healing, guidance, and protection.
• Spirit Hierarchy: Sami beliefs describe multiple layers of the cosmos, each governed by different spirits. Higher-tier spirits held more power, while lower-tier spirits were associated with everyday natural features like individual trees or rocks.
• Landvættir (Land Spirits): In addition to sieidi spirits, the Sami recognized various land spirits—guardian entities tied to specific territories, rivers, and forests that could be benevolent or dangerous depending on how they were treated.
• Offerings and Taboos: Strict taboos governed behavior near sacred sites. Violating these taboos was believed to bring misfortune, illness, or the wrath of the spirits. Regular offerings were made to maintain good relations.
• Reindeer and Spiritual Connection: Reindeer held a unique spiritual status among the Sami. They were not only vital for survival but also seen as spiritually connected to the realm of the ancestors and nature spirits.
• Impact of Christianization: Beginning in the 17th century, Christian missionaries actively suppressed Sami spirit worship, destroying sieidi sites and banning drum rituals. Despite this, many beliefs and practices survived in folk traditions and have experienced a cultural revival in recent decades.