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Rajasthani
Is one of the prominent languages of Indo-Aryan language family. It is spoken by around eighty million persons (total number of speakers 36 million as of Census of India, 2001) in Rajasthan and other states of India, and has eight major dialects: Bagri, Shekhawati, Mewati, Dhundhari, Harauti, Marwari, Mewari, and Wagri. Most of these dialects of Rajasthani are chiefly spoken in the state of Rajasthan and adjacent parts of Gujarat, in the Malwa and Nimar regions of western Madhya Pradesh, and the Pakistani provinces of Punjab and Sind. Rajasthani language is classified in the Central Zone of the Indo-Aryan languages, which also includes Hindi and Urdu. Some of the Rajasthani dialects are considered by some to be dialects of Hindi; however, many linguists agree that Rajasthani is a different language from Hindi at Phonological, Morphological, Syntactical and lexical level.
Some Rajasthani dialects are given below: Dhatki, Goaria, Loarki, Marwari, Mewari, Bagri, Gade Lohar, Gujari, Harauti, Malvi, Nimadi.

Ratagnon
(Also transliterated as Latagnon or Datagnon) is a language spoken by the Ratagnon people, an indigenous group from Occidental Mindoro. Its speakers are shifting to Tagalog, and it is nearly extinct.

Réunion Creole
Reunionese Creole, or bourbonnais is a creole language spoken on Réunion Island. It is derived mainly from French and a few terms from other languages (Indian, Chinese...).

Romanian
Is the fifth of the Romance languages in terms of number of speakers. It is spoken as a first language by somewhere around 24 to 26 million people, and enjoys official status in Romania, Moldova and the Autonomous Province of Vojvodina (Serbia). The official form of the Moldovan language in the Republic of Moldova is identical to the official form of Romanian save for a minor rule in spelling. Romanian is also an official or administrative language in various communities and organisations (such as the Latin Union and the European Union – the latter as of 2007).

Romansh
(Also spelled Rumantsch, Romansch or Romanche) is one of the four national languages of Switzerland, along with German, Italian and French. It is a Romance language, believed to have descended from the vulgar Latin spoken by Roman era occupiers of the region, and, as such, somewhat resembles Italian and French. It is spoken by about 50,000-70,000 people in the canton of Graubünden (Grisons), of which about 35,000 speak it as their first language. Spoken by fewer than 1% of Switzerland's 7.4 million inhabitants, it is the smallest of Switzerland's national languages in terms of number of speakers, about half the size of Switzerland's largest community of speakers of a non-official language, Serbo-Croatian with some 111,000 speakers.

Romani
(Or Romany) is the language of the Roma and Sinti, peoples often referred to in English as "Gypsies". The Indo-Aryan Romani language should not be confused with either Romanian (spoken by Romanians), or Romansh (spoken in parts of southeastern Switzerland), both of which are Romance languages.

Romblomanon
Is the language in Romblon. It includes the dialects Sibuyanon, Inunhan or Onhan, and Bantoanon or Asi.

Rotokas
Is a language (part of the East Papuan language family) spoken by some 4000 people in Bougainville, an island to the east of New Guinea, part of Papua New Guinea. There are at least three dialects of the language: Central Rotokas ("Rotokas Proper"), Aita Rotokas, and Pipipaia. Central Rotokas is most notable for its extremely small phonemic inventories and for having perhaps the smallest modern alphabet.

Runyankole
(Also Runyankore) is a Bantu language spoken by the Ankole tribe of Southwestern Uganda. There are approximately 1 million native speakers, mainly found in the Mbarara District.

Russenorsk
Or Russonorsk (Norwegian for "Russo-Norwegian") was a pidgin language combining elements of Russian and Norwegian, created by traders and whalers from northern Norway and the Russian Kola peninsula. As is common in the development of pidgins and trade languages, the interaction of seamen, fishermen, and traders with no common language necessitated the creation of some minimal form of communication. Like all pidgins, Russenorsk was not a complex system of communication. It had a rudimentary grammar and a restricted vocabulary mostly composed of words essential to Arctic fishing and trade (fish, weather, etc.) and did not particularly deal with unrelated issues (music, politics, etc.).

Russian
Is the most widely spoken language of Eurasia and the most widespread of the Slavic languages. Russian belongs to the family of Indo-European languages. Within the Slavic family, Russian is one of three living members of the East Slavic group, the other two being Belarusian and Ukrainian.

Russian Sign Language
Is the sign language of the deaf community in Russia. It has a grammar unlike the (spoken or written) Russian language, although there is a "signed Russian" which has been used on television in interpreted news programs. The Moscow Bilingual School for the Deaf, which uses Russian Sign Language in classrooms, was opened in 1992.

Ruthenian
Was a historic East Slavic language, spoken after 1569 in the East Slavic territories of the Polish-Lithuanian Commonwealth. Having evolved from the Old East Slavic language, Ruthenian was the ancestor of modern Belarusian. It is sometimes also called "Old Belarusian" (Belarusian starabjelaruskaja mova) or even "West Russian" (Russian zapadnorusskij jazyk).