Rudolph Koenig (1832–1901) was a 19th-century physicist and scientific instrument maker based in Paris, chiefly concerned with acoustic phenomena.
Koenig did a great deal to bring experimental acoustics into the mainstream of physics. Originally he trained as a violin maker under Jean Baptise Vuillaume (1798-1875), but later devoted his life to building instruments for the study of acoustics. He perfected the tuning fork and built instruments designed by Helmholtz and others, as well as inventing his own.
- David Pantalony, Altered Sensations: Rudolph Koenig's Acoustical Workshop in Nineteenth-Century Paris, Springer, 2009.