Janusz Witold Domaniewski (30 April 1891 – 15 March 1954) was a Polish ornithologist and conservationist.
He was a curator at the Warsaw zoological museum and was involved in the establishment of a nature preserve in the Tatra mountains.
In 1921 he moved to live in Zakopane where his wife Irena was to recover from a lung illness and returned to Warsaw in 1930 to serve at the museum.
Domaniewski wrote extensively about hunting and the fauna of the Tatra mountains.
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