Rezso (Rudolf) Kemény (March 21, 1871 Nyíregyháza — July 7, 1945) was a Hungarian violinist and violin teacher.
Kemény studied violin with Alois Gobbi at the National Conservatory and with Jeno Hubay at the Musical Academy in Budapest and with Joseph Joachim in Berlin.
Since 1890 he worked in Königsberg as conductor and was a teacher at the Königsberg Conservatory and was appointed 1897 to Professor and co-director.
In the autumn of 1898 he returned to Budapest and was a violin teacher at the Music Academy.
In the years 1898–1934 he was on the concert tour.
He was from 1899 a member (2nd violin) of Hubay-Popper Quartet.
In 1918 he founded separately his own Kemény-Schiffer quartet.
Jeno Hubay dedicated to Kemény his piece Scherzo Diabolique op.