Frederik Rung, (June 14, 1854 - January 22, 1914, aged 60) was a Danish composer, the son of Henrik Rung and his wife was Sophie Keller, soprano and royal singer.
He was conductor Madrigal Choir of the Caeciliaforening (St Cecilia Society) of Copenhagen, and Grieg dedicated to this choir and its conductor his Two religious choral pieces of 1898.His son Paul Sophüs Christian Henrik Rung-Keller ou P.
S.
Rung-Keller (1879-1966) was also an organist and composer.