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Folk metal is a fusion genre of heavy metal music and traditional folk music that developed in Europe during the 1990s. It is characterised by the widespread use of folk instruments and, to a lesser extent, traditional singing styles. It also sometimes features soft instrumentation influenced by folk rock. The earliest folk metal bands were Skyclad from England and Cruachan from Ireland. Skyclad's debut album The Wayward Sons of Mother Earth was released in 1991 and would be considered a thrash metal album with some folk influences, unlike Cruachan’s early work which embraced the folk element as a defining part of their sound. It was not until 1994 and 1995 that other early contributors in the genre began to emerge from different regions of Europe and beyond. Among these early groups, the German band Subway to Sally spearheaded a different regional variation that over time became known as medieval metal. Despite their contributions, folk metal remained little known with few representatives during the 1990s. It was not until the early 2000s when the genre exploded into prominence, particularly in Finland with the efforts of such groups as Finntroll, Ensiferum, Korpiklaani, Turisas, and Moonsorrow.

Pagan metal is "more of an idea than a genre" and consequently bands tend to be "wildly different" from one another. Bassist Jarkko Aaltonen of the band Korpiklaani notes that bands singing about "Vikings or other ancient tribes of people are all labelled as pagan", regardless of whether they use folk instruments. Heri Joensen expressed a similar description of pagan metal as bands that sing about "pre-Christian, European traditions, be they historical or mythological" and notes that it is "musically extremely diverse because it is more about the lyrics than the music". Some bands are known to be "sprightly and spirited" while others are "bleak and doomy". Vocal styles range from "melodic chanting to unearthly growling" and while some acts sing in their native language, others sing in English. Pagan metal bands are often associated with Viking metal and folk metal. Bands such as Moonsorrow and Kampfar have been identified as fitting within all three of those genres.

 is a style of heavy metal music with origins in black metal and Nordic folk music, characterized by a lyrical and thematic focus on Norse mythology, Norse paganism, and the Viking Age. Viking metal is quite diverse as a musical style, to the point where some consider it more a cross-genre term than genre, but it is typically manifested as black metal with influences from Nordic folk music. Common traits include a slow-paced and heavy riffing style, anthemic choruses, use of both clean and harsh vocals, a reliance on folk instrumentation, and often the use of keyboards for atmospheric effect.

Viking metal emerged during the late-1980s through the mid-1990s as a rejection of Satanism and the occult, instead embracing the Vikings and paganism as the leaders of opposition to Christianity. It is similar, in lyrics, sound, and thematic imagery, to pagan metal, but pagan metal has a broader mythological focus and uses folk instrumentation more extensively. Most Viking metal bands originate from the Nordic countries, and nearly all bands claim that their members descend, directly or indirectly, from Vikings.

Though artists such as Led Zeppelin, Yngwie Malmsteen, Heavy Load, and Manowar have previously dealt with Viking themes, Bathory from Sweden is generally credited with pioneering the style with its albums Blood Fire Death (1988) and Hammerheart (1990), which launched a renewed interest in the Viking Age among heavy metal musicians. Enslaved, from Norway, followed up on this burgeoning Viking trend with Hordanes Land (1993) and Vikingligr Veldi (1994). Burzum, Emperor, Einherjer, and Helheim, among others, helped further develop the genre in the early through mid-1990s. Through the work of artists such as the German project Falkenbach, Viking metal soon spread from the Nordic countries to other nations with Viking history or an even broader Germanic heritage, and has since influenced musicians across the globe. The death metal bands Unleashed and Amon Amarth, which emerged in the early 1990s, also adopted Viking themes, broadening the style from its primarily black metal origin.