The revision of the populations of ants of the genus Proformica in Greece recently led to the discovery of two new endemic species: Proformica chelmosensis Lebas & Galkowski, 2019, and Proformica lebasi Borowiec & Salata, 2022. With these descriptions, the number of Proformica species in Greece increased to four. The description of a new species, Proformica borowieci sp. nov., found on Mount Parnassus in Central Greece is presented in this article. Its characters make it a sister species to P. chelmosensis from the northern Peloponnese. Its name honours the immense work of Lech Borowiec in studies on the myrmecofauna of Greece. The morphological characteristics and those related to cuticular hydrocarbons of this new species are examined.