The Hungarian Phantasy (or Fantaisie sur des motifs hongrois), Op. 35, is a celebrated work for two flutes and piano (or orchestra) co-authored by the Hungarian brothers Karl Doppler (1825–1900) and Franz Doppler (1821–1883).

Originally this work was scored for two flutes and piano, though arrangements for two flutes and orchestra or string ensemble also exist.

The piece is a virtuosic display of the style hongrois, featuring traditional Hungarian folk-like themes, dramatic cadenzas, and high-energy tempos typical of 19th-century salon music.

The Doppler brothers frequently toured together as a flute duo and co-composed several works to showcase their synchronization and technical prowess.

It is often confused with Franz Doppler’s solo work, Hungarian Pastoral Fantasy, Op. 26, but Op. 35 is distinguished by being a duet