The Sámi languages (/ˈsɑːmi/ SAH-mee), also rendered in English as Sami and Saami, are a group of Uralic languages spoken by the Indigenous Sámi peoples in Northern Europe (in parts of northern Finland, Norway, Sweden, and extreme northwestern Russia). There are, depending on the nature and terms of division, ten or more Sami languages. Several spellings have been used for the Sámi languages, including Sámi, Sami, Saami, Saame, Sámic, Samic and Saamic, as well as the exonyms Lappish and Lappic. The last two, along with the term Lapp, are now often considered pejorative.

The Sámi languages form a branch of the Uralic language family. According to the traditional view, Sámi is within the Uralic family most closely related to the Finnic languages (Sammallahti 1998). However, this view has recently been doubted by some scholars who argue that the traditional view of a common Finno-Sami protolanguage is not as strongly supported as had been earlier assumed, and that the similarities may stem from an areal influence on Sámi from Finnic.

In terms of internal relationships, the Sámi languages are traditionally divided into the two groups of western and eastern. The groups may be further divided into various subgroups and ultimately individual languages. (Sammallahti 1998: 6-38.) Recently it has been proposed on the basis of (1) different sound substitutions seen between the Sámi languages in the Proto-Scandinavian loanwords and (2) historical phonology that the first unit to branch off from Late Proto-Sámi was Southern Proto-Sámi, from which descend South Sámi, Ume Sámi, and Gävle Sámi (extinct during the 19th century).

Parts of the Sámi language area form a dialect continuum in which the neighbouring languages may be mutually intelligible to a fair degree, but two more widely separated groups will not understand each other's speech. There are, however, some sharp language boundaries, in particular between Northern Sami, Inari Sami and Skolt Sami, the speakers of which are not able to understand each other without learning or long practice. The evolution of sharp language boundaries seems to suggest a relative isolation of the language speakers from each other and not very intensive contacts between the respective speakers in the past. There is some significance in this, as the geographical barriers between the respective speakers are no different from those in other parts of the Sámi area.

The above figures are approximate.

The Sami languages are spoken in Sápmi in Northern Europe, in a region stretching over the four countries Norway, Sweden, Finland and Russia, reaching from the southern part of central Scandinavia in the southwest to the tip of the Kola Peninsula in the east. The borders between the languages do not align with the ones separating the region's modern states.

During the Middle Ages and early modern period, now-extinct Sami languages were also spoken in the central and southern parts of Finland and Karelia and in a wider area on the Scandinavian Peninsula. Historical documents as well as Finnish and Karelian oral tradition contain many mentions of the earlier Sami inhabitation in these areas (Itkonen, 1947). Also, loanwords as well as place-names of Sami origin in the southern dialects of Finnish and Karelian dialects testify of earlier Sami presence in the area (Koponen, 1996; Saarikivi, 2004; Aikio, 2007). These Sami languages, however, became extinct later, under the wave of the Finno-Karelian agricultural expansion.

The Proto-Sámi language is believed to have formed in the vicinity of the Gulf of Finland between 1000 BC to 700 AD, deriving from a common Proto-Sami-Finnic language (M. Korhonen 1981). However, reconstruction of any basic proto-languages in the Uralic family have reached a level close to or identical to Proto-Uralic (Salminen 1999). According to the comparative linguist Ante Aikio, the Proto-Samic language developed in South Finland or in Karelia around 2000–2500 years ago, spreading then to northern Fennoscandia. The language is believed to have expanded west and north into Fennoscandia during the Nordic Iron Age, reaching central Scandinavia during the Proto-Scandinavian period ca. 500 AD (Bergsland 1996). The language assimilated several strata of unknown Paleo-European languages from the early hunter-gatherers, first during the Proto-Sami phase and second in the subsequent expansion of the language in the west and the north of Fennoscandia that is part of modern Sápmi today. (Aikio 2004, Aikio 2006).