Pirnat is a surname from Slovenia. People with the surname include:
Makso Pirnat (1875–1933), Slavic scholar, father of Nikolaj Pirnat Nikolaj Pirnat (1903–1948), Slovenian painter, sculptor, draftsman and illustrator Nina Pirnat, former director of the Slovenian National Institute of Public Health - see COVID-19 pandemic in Slovenia Rajko Pirnat (born 1951), Slovenian lawyer, politician and university professor Stanko Pirnat (1859–1899), Slovenian composer and lawyer