Bishop Jan Niemiec (; ; 14 March 1958 – 27 October 2020) was a Polish-born Ukrainian Roman Catholic prelate. He was an Auxiliary bishop of the Roman Catholic Diocese of Kamyanets-Podilskyi and the Titular Bishop of Decoriana from 21 October 2006 until his death on 27 October 2020. He was born in Kozłówek, Poland.