Adıyaman (Kurdish: Semsûr) is a city in southeastern Turkey, and the capital of the Adıyaman Province. Its inhabitants are mostly Kurdish.
An unverified theory is that the former name of the city Hisn-Mansur derives from the name of the Umayyad Emir Mansur ben Djawana who was killed by Al-Mansur in 758. Because of the difficulty among the local Kurds in pronouncing Hisn-Mansur, the corruption Semsûr emerged.
The name of the city was changed to Adıyaman in the Republican era, meaning "egregious name" in Turkish. Various unverifiable theories exist for the name.
There is some passing tourist trade, the main tourist attraction being Mount Nemrut.
Adıyaman has a hot summer Mediterranean climate (Csa) under both the Köppen classification, and a dry-hot summer subtropical climate (Csa) under the Trewartha classification, with some continental characteristics. Summers are very hot and very dry. Temperatures often reach 40 °C (104 °F) at the height of summer. The highest recorded temperature was 45.3 °C (113.5 °F) on 30 July 2000. Winters in Adıyaman are cool to cold with heavy precipitation. Due to its inland location and relatively high altitude, frost and snow are common. The lowest recorded temperature was −14.4 °C (6.1 °F) on 24 January 1972.