Ukko in the context of Tapio (spirit)

Baltic Finnic paganism, or Baltic Finnic polytheism was the indigenous religion of the various Baltic Finnic peoples, specifically the Finns, Estonians, Võros, Setos, Karelians, Veps, Izhorians, Votes and Livonians, prior to Christianisation. It was a polytheistic religion, worshipping a number of different deities. The chief deity was the god of thunder and the sky, Ukko; other important deities included Jumala, Ahti, and Tapio. Jumala was a sky god; today, the word "Jumala" refers to a monotheistic God. Ahti was a god of the sea, waters and fish. Tapio was the god of the forest and hunting.

Baltic Finnic paganism included necrolatry (worship of the dead) and shamanism (tietäjä(t), literally "one who knows"), and the religion was not always uniform across the areas it was practiced, as customs and beliefs varied during different periods of time and regions. Baltic Finnic paganism shares some features with its neighbouring Baltic, Norse and Germanic pagan beliefs.

Modern Finnish paganism, also known as Finnish neopaganism or the Finnish native faith (Finnish: Suomenusko: "Finnish Belief / Belief of Finland"), is the contemporary revival of Finnish paganism, the pre-Christian polytheistic ethnic religion of the Finns. A precursor movement was the Ukonusko ("Ukko's Faith", revolving around the god Ukko) of the early 20th century. The main problem in the revival of Finnish paganism is the nature of pre-Christian Finnish culture, which relied on oral tradition which may be subject to change over time. The primary sources concerning Finnish native culture are written by latter-era Christians.

There are two main organisations of the religion, the "Association of Finnish Native Religion" (Suomalaisen kansanuskon yhdistys ry) based in Helsinki and officially registered since 2002, and the "Pole Star Association" (Taivaannaula ry) headquartered in Turku with branches in many cities, founded and officially registered in 2007. The Association of Finnish Native Religion also caters to Karelians and is a member of the Uralic Communion.

Finnish mythology commonly refers to the folklore of Finnish paganism, of which a modern revival is practiced by a small percentage of the Finnish people. It has many shared features with Estonian and other Finnic mythologies, but also with neighbouring Baltic, Slavic and, to a lesser extent, Norse mythologies.

Finnish mythology survived within an oral tradition of mythical poem-singing and folklore well into the 19th century.

Tharapita (variations of the name include Taara, Tooru, and Tarapitha), also known as Jumal, is a prominent god in Estonian mythology, with a strong resemblance to the Finnish Ukko and the Germanic Thor.