John Hermann Kahnert (born Juan Kahnert, 4 March 1928 – 3 September 2021) represented Argentina at the 1948 Summer Olympics in London, he was entered in the shot put. His personal best in the shot put was 16.75 in 1956.
Kahnert later emigrated to the United States, settling in suburban Baltimore. He earned a PhD and worked as a college professor.