The ruble or rouble (Russian: рубль rublʹ, plural рубли́ rubli; see note on English spelling and Russian plurals with numbers) (code: RUB) is the currency of the Russian Federation and the two partially recognized republics of Abkhazia and South Ossetia. Formerly, the ruble was also the currency of the Russian Empire and the Soviet Union prior to their breakups. Belarus and Transnistria also use currencies with the same name. The ruble is subdivided into 100 kopeks (sometimes transliterated kopecks, or copecks; Russian: копе́йка, kopéyka; plural: копе́йки, kopéyki). The ISO 4217 code is RUB or 643; the former code, RUR or 810, refers to the Russian ruble prior to the 1998 denomination (1 RUB = 1000 RUR).

Currently there is no official symbol for the ruble, though the abbreviation руб. is in wide use. Various symbols have been put forward as possibilities, including: "РР" (Cyrillic for "RR"), an "R" with two horizontal strokes across the top (similar to the Philippine peso sign), ₱, a "Р" with one horizontal strike.