The Faculty of Natural Sciences (FNS) (Slovak: Prírodovedecká Fakulta (PriF UK)) is a faculty of the Comenius University in Bratislava.
Efforts to establish the Faculty of Natural Sciences in Slovakia during the interwar period were not successful. After split of the Czechoslovakia into the Protectorate of Bohemia and Moravia and the Slovak Republic and disposal of Czech higher education, Slovak students had no more science colleges available. The Natural Sciences Faculty of Slovak University (former name of Comenius University in Bratislava) was founded in 1940 and education in the first semester started in autumn 1940/1941. Faculty become independent from the Faculty philosophy of the then Slovak University, where some science subjects were previously taught. The first Dean was the František Valentin. From the beginning it consisted of Botanical and Geographical institute, the institute also Zoology and Comparative Anatomy. Several subjects as mathematics, physics and chemistry, were taught in the lecture hall of Slovak technical college.[1] In the 1941 Geological Institute was added. A year later Mineralogical and Petrographic Institute was established. Both working in makeshift conditions without sufficient qualified staff. In the winter semester of 1942/1943 Institute of Nuclear Physics was added to the faculty and in 1944, Astronomical Institute and Institute of Mathematics were established. Only science without a separate department until 1948 was the chemistry. In the 1950 former institutes were organized into the departments. In 1980, Faculty of Mathematics, Physics and Informatics was separated from the Natural Sciences Faculty.
Individual departments were formerly housed in several buildings in the center of Bratislava. From 1960s to 1987 five pavilion complex was built in the Mlynská Dolina Valley in the Bratislava for purposes of the Faculty. Apart from them, faculty has buildings of the Botanical garden, Department of Botany and a Biological research station at Šúr.
The Natural Sciences faculty is divided up into the following sections: