Ilgaz Mountains (Turkish: Ilgaz Dağları) is a mountain range in northwest Anatolia, Turkey.
In west Black Sea region, there are three ranges of mountains, which run parallel to the Black Sea coast. Ilgaz Mountains constitute the eastern part of the second range from the coast line at an average distance of 100 km (62 mi). The northern slopes of the mountains are in Kastamonu Province and the southern slopes are in Çankırı Province. The length of the mountain system from west to east is about 150 km (93 mi) with a width of about 30 km (19 mi). Situated at 41°06′N 33°52′E / 41.100°N 33.867°E, the mountain peak, known as Hacettepe, is 2,587 m (8,488 ft) high. The state highway , which connects Black Sea coast to Central Anatolia is 10 km (6.2 mi) west of the peak. The altitude of the highest pass on the highway is 1,850 m (6,070 ft).
The Mount Ilgaz National Park (Turkish: Ilgaz Dağı Milli Parkı) at the west of the highway pass was opened on June 2, 1976 and is easily accessible from the highway . Total area of the park is 732 ha (7.32 km2). At the highest elevation of the park, there are a number of hotels servicing to skiers. The skiers may use a 1,500 m (4,900 ft) long chairlift to the ski area. The distance from Ankara is 200 km (120 mi), which makes the park nearest winter sports resort to the capital city citizens. During the summertime, the visitors may fish in the Baldıran Valley within the national park.