Márk Rózsavölgyi (pronounced [ˈmaːrk ˈroːʒɒvølɟi]; born Mordecai Rosenthal; 14 August 1787 – 23 January 1848) was a Hungarian composer and violinist.

Rózsavölgyi was born to a poor tradesman's family in Balassagyarmat, where his bust (made by Jelena Veszely in 1973) can be found in the Palóc-parkland.

Basing himself in Pest, he travelled through the Habsburg Empire for many years, including extended stays in Baja and Temesvár (now Timișoara, Romania).

In 1824, he was made a regular salaried member of the Philharmonic Society of the county of Veszprém, and his name "Rosenthal" was Magyarized to "Rózsavölgyi" (both mean 'rose valley' in German (or Yiddish) and Hungarian respectively) on the occasion of his election.

A number of famous Romani musicians, including Patikárus, Sárközi, Farkas, and others, were pupils of Rózsavölgyi.