Sámuel Nemessányi (Nemessànyi), Hungarian: Nemessányi Sámuel (January 12, 1837, in Verbicz-Hušták, Liptószentmiklós, Liptó County – March 5, 1881, Budapest) was a Hungarian luthier, a maker of stringed instruments, such as: violins, violas, and cellos.
Nemessányi is considered the most talented and important maker in the Hungarian violin-making school.
During his lifetime, he was already acknowledged as the most outstanding craftsmen of stringed instruments in all of Hungary and his instruments are of great importance to Hungarians.
His life and work strikingly parallels that of Italian luthier Giuseppe Guarneri del Gesù.