Mikołaj Pomarnacki was a Polish fencer who competed in the épée team event at the 1964 Tokyo Olympics. Outside of the Olympics Pomarnacki had success at the Polish Championships winning silver in the épée in 1964 and 1965, silver in the foil in 1956, and a bronze in the épée in 1966. In the team competition he won silver in the épée in 1968 and 1969, silver in the foil in 1956, and a bronze in the épée in 1963. Pomarnacki also worked as a fencing coach from 1965 to 1975 and spent several years as a fencer in Italy.