Vsevolod Mikhailovich Eikhenbaum (Russian: ???´????? ????´?????? ???????´??, French: Vsevolod Mikhaïlovitch Eichenbaum; 11 August 1882 – 18 September 1945), known in later life as Volin or (the spelling he used himself) Voline (??´???), was a leading Russian anarchist who participated in the Russian and Ukrainian Revolutions before being forced into exile by the Bolshevik Party government.
He was a main proponent of the anarchist organizational form known as synthesis anarchism.