Sinanpaşa (or Sincanlı) is a town and district of Afyonkarahisar Province, Turkey on a plain surrounded by pine-covered mountains, 33 km from the city of Afyon on the road to Uşak and İzmir. It covers an area of 845 km², and the population (2010) is 42,294 of which 3,924 live in the town of Sinanpaşa, while the majority live in the surrounding countryside. the mayor is Nuri Köse (AKP).
Winters are cold and snowy, and summers are dry and hot.
The area has been a crossroads since antiquity, with archaeological evidence indicating habitation since 4000 BC. Surface excavations in the village of Küçükhöyük go back to 3000 BC.
The name Sinan Paşa comes from the son of a lord of the Akkoyunlu Turks who in 1473 took refuge with Ottoman Sultan Mehmet II during the war between the Akkoyunlu and the warrior Uzun Hasan (the Otlukbeli War). Later in the Ottoman period the important general Hersekzade Ahmet Paşa settled here in the village still known as Ahmet Paşa today.