Finno-Ugric (/ˌfɪnoʊˈjuːɡrɪk, -ˈuː-/) is a traditional linguistic grouping of all languages in the Uralic language family except for the Samoyedic languages. Its once commonly accepted status as a subfamily of Uralic is based on criteria formulated in the 19th century and is criticized by contemporary linguists such as Tapani Salminen and Ante Aikio. The three most spoken Uralic languages, Hungarian, Finnish, and Estonian, are all included in Finno-Ugric.

The term Finno-Ugric, which originally referred to the entire family, is occasionally used as a synonym for the term Uralic, which includes the Samoyedic languages, as commonly happens when a language family is expanded with further discoveries. Before the 20th century, the language family might be referred to as Finnish, Ugric, Finno-Hungarian or with a variety of other names. The name Finno-Ugric came into general use in the late 19th or early 20th century.

The validity of Finno-Ugric as a phylogenic grouping is currently disputed, with some linguists maintaining that the Finno-Permic languages are as distinct from the Ugric languages as they are from the Samoyedic languages spoken in Siberia, or even that none of the Finno-Ugric, Finno-Permic, or Ugric branches has been established. Received opinion is that the easternmost (and last discovered) Samoyed had separated first and the branching into Ugric and Finno-Permic took place later, but this reconstruction does not have strong support in the linguistic data.

Attempts at reconstructing a Proto-Finno-Ugric proto-language, a common ancestor of all Uralic languages except for the Samoyedic languages, are largely indistinguishable from Proto-Uralic, suggesting that Finno-Ugric might not be a historical grouping but a geographical one, with Samoyedic being distinct by lexical borrowing rather than actually being historically divergent. It has been proposed that the area in which Proto-Finno-Ugric was spoken reached between the Baltic Sea and the Ural Mountains.

Traditionally, the main set of evidence for the genetic proposal of Proto-Finno-Ugric has come from vocabulary. A large amount of vocabulary (e.g. the numerals "one", "three", "four" and "six"; the body-part terms "hand", "head") is only reconstructed up to the Proto-Finno-Ugric level, and only words with a Samoyedic equivalent have been reconstructed for Proto-Uralic. That methodology has been criticised, as no coherent explanation other than inheritance has been presented for the origin of most of the Finno-Ugric vocabulary (though a small number has been explained as old loanwords from Indo-Iranian languages or perhaps other Indo-European languages).

The Samoyedic group has undergone a longer period of independent development, and its divergent vocabulary could be caused by mechanisms of replacement such as language contact. (The Finno-Ugric group is usually dated to approximately 4,000 years ago, the Samoyedic a little over 2,000.) Proponents of the traditional binary division note, however, that the invocation of extensive contact influence on vocabulary is at odds with the grammatical conservatism of Samoyedic.

The consonant *š (voiceless postalveolar fricative, [ʃ]) has not been conclusively shown to occur in the traditional Proto-Uralic lexicon, but it is attested in some of the Proto-Finno-Ugric material. Another feature attested in the Finno-Ugric vocabulary is that *i now behaves as a neutral vowel with respect to front-back vowel harmony, and thus there are roots such as *niwa- "to remove the hair from hides".

Regular sound changes proposed for this stage are few and remain open to interpretation. Sammallahti (1988) proposes five, following Janhunen's (1981) reconstruction of Proto-Finno-Permic: