Finno-Volgaic or Fenno-Volgaic is a defunct hypothesis of a subgrouping of the Uralic languages

Uralic languages

The Uralic languages constitute a language family of some three dozen languages spoken by approximately 25 million people. The healthiest Uralic languages in terms of the number of native speakers are Hungarian, Finnish, Estonian, Mari and Udmurt...

 that tried to group the Finnic languages

Finnic languages

The term Finnic languages often means the Baltic-Finnic languages, an undisputed branch of the Uralic languages. However, it is also commonly used to mean the Finno-Permic languages, a hypothetical intermediate branch that includes Baltic Finnic, or the more disputed Finno-Volgaic languages....

, Sami languages

Sami languages

Sami or Saami is a general name for a group of Uralic languages spoken by the Sami people in parts of northern Finland, Norway, Sweden and extreme northwestern Russia, in Northern Europe. Sami is frequently and erroneously believed to be a single language. Several names are used for the Sami...

, Mordvinic languages

Mordvinic languages

The Mordvinic languages, alternatively Mordvin languages, or Mordvinian languages, are a subgroup of the Uralic languages, comprising the closely related Erzya language and Moksha language.Previously considered a single "Mordvin language",...

 and the Mari language

Mari language

The Mari language , spoken by more than 600,000 people, belongs to the Uralic language family. It is spoken primarily in the Mari Republic of the Russian Federation as well as in the area along the Vyatka river basin and eastwards to the Urals...

. It was hypothetized to have branched from Finno-Permic languages

Finno-Permic languages

The Finno-Permic languages are a traditional but disputed ,group of the Uralic languages that comprises the Baltic-Finnic languages, Sami languages, Mordvinic languages, Mari language, Permic languages, and likely a number of extinct languages...

 about 2000 BC.

Finnic and Sami languages are sometimes grouped together under Finno-Lappic languages

Finno-Lappic languages

The Finno-Lappic languages are a hypothetical subgroup of the Uralic family, and are made up of 22 languages classified into either the Sami languages , which are spoken by the Sami people who inhabit the Sápmi region of northern Fennoscandia, or Finnic languages, which include the major languages...

, while Mordvinic and Mari were formerly grouped together as the defunct group of Volga-Finnic languages.

The current stage of research rejects Volga-Finnic, while the validity of Finno-Lappic and Finno-Permic remains disputed.

Only a single uniting phonological feature of the Finno-Volgaic languages has been proposed: the loss of the consonant *w before rounded vowels.