Abstract. Akçay ME, Uzun Y. 2026. Macrofungal diversity of Sarıkamış Allahuekber Mountains National Park (Kars/Erzurum, Türkiye). Nusantara Bioscience 18 (2): n180203. https://doi.org/10.13057/nusbiosci/n180203. Macrofungal inventories in protected mountain forests provide baseline data for biodiversity monitoring and conservation planning. This study presents a historical inventory of macrofungi documented in Sarıkamış Allahuekber Mountains National Park, northeastern Türkiye, based on specimens collected from 49 localities during 2011-2016 and examined using macro- and micromorphological characters. The field campaign comprised approximately 75 survey days and yielded 920 specimens. After a cautious reassessment of doctoral-thesis material under current nomenclature, 240 species were retained; records requiring molecular reassessment were excluded. Accepted names and author citations were cross-checked against Index Fungorum and MycoBank, together with recent Turkish checklist sources. The retained taxa belong to 5 classes, 12 order-level categories, 54 family-level categories and 117 genera. These taxa represent new records for the national park in the published literature, not national-level new records for Türkiye. The inventory links taxa with habitat, locality, date, collection number, Turkish vernacular name and edibility/use-value code. Scots pine forests and pine-derived substrates accounted for 292 of 416 voucher-linked records. Because sampling effort was not standardized, seasonal and habitat patterns are interpreted as collection-record frequencies. The study provides a reference point for future effort-standardized surveys and conservation planning in this protected high-altitude Scots pine ecosystem.