Jacek Namieśnik (10 December 1949 – 14 April 2019) was a Polish chemist. He was a full professor of Gdańsk University of Technology. He was the head of Analytical Department (1995–2019), dean of Faculty of Chemistry (1996–2002, 2005–2012), rector of Gdańsk University of Technology since 1 September 2016 until his death. He was born in Mogilno, Poland.
Namieśnik died on 14 April 2019 in Gdansk at the age of 69. The cause was probably heart failure.