Karl Johann Nepomuk Ernst Luchs (3 September 1811 – 3 January 1886) was a German physician in the Silesian spa town of Bad Warmbrunn.
He was also a naturalist, aviculturist, and collector of natural history specimens.
He studied medicine at the University of Breslau with a dissertation De sphygmologia (1836) and worked as a spa doctor at Warmbrunn throughout the rest of his life.
He was a keen aviculturist and also made a collection of bird skins which he sold in 1878 to Ludwig Graf von Schaffgotsch (1842–1891).
The ornithologist Otto Finsch named Myiopsitta luchsi (now usually treated as a subspecies of the monk parakeet Myiopsitta monachus luchsi) after him.