Sadak is a village in Kelkit District, in Gümüşhane Province, Türkiye. Sadak lies at 1,699 m above sea level, in the Otlukbeli Dağları mountains. It has 1,013 inhabitants. The nearest city is Kelkit, 17.5 km to the northwest. Among the landmarks around are Satala (0.4 km) and Altıntepe (37 km).