Aim of study: Aim was to determine the vascular flora of the Ormanüstü Planning Unit (Karadeniz Technical University Education-Research and Application Forest).Area of study: The research area is under the influence of the Euro-Siberian phytogeographical region and is represented with a high rate (44%, 288 taxa). Irano-Turanian and Mediterranean elements are represented by 26 (4%) and 22 taxa (3%), respectively. Totally 320 taxa (49%) are multi-regional or of unknown origin. In addition, 33 endemic (5%), 12 rare (1.8%), 5 alien (0.8%) and 17 cosmopolitan (2.6%) taxa were identified.Material and methods: The entire study area was visited periodically and plant samples were collected from 166 sample plots (1000 m 2 ), and then they were pressed with wooden frames. Approximately 1800 vascular plant specimens were collected between the years 2005 and 2008 to form the floristic list.Main results: Studies revealed the presence of 656 taxa (585 species, 62 subspecies and 9 varieties) belonging to 95 families and 354 genera. Of these, 22 taxa (3.4%) are ferns and 634 (96.6%) are seed plants. The best-represented families are as follows; Asteraceae (75), Poaceae (48) and Fabaceae (41). According to richest genera; Campanula (14), Carex (10), Alchemilla (9) and Geranium ( 9) have the greatest number of taxa.Highlights: It was concluded that the study area is important in terms of plant diversity. The discovery of a new species from this area, described by us and published in 2009 (Astragalus ansinii Uzun, Terzioğlu & Pal.-Uzun), supports this fact.