Svilajnac ( pronounced /sviːlaɪnʌt͡s/; Serbian Cyrillic: Свилајнац, Romanian: Svilaina) is a town and municipality located in central Serbia at 44.13° North, 21.12° East, 100 km (62 mi) south-east of Belgrade, on the banks of the river Resava, and bordering the river Morava. Its name stems from the word for silk in Serbian. It is the de facto administrative center of the Resava region. The population of the town is 9,131 while municipality has 23,391.

Svilajnac was first mentioned in Turkish records in 1467 as a village of a hundred households. The village, and later town, gained prominence through its silk (Serbian:svila) production, from which it derives its name. Location at the crossroads between north-east, south-east and western Serbia helped it flourish as a trading center, where silk, wool and livestock were traded.

Svilajnac and the area around it have been the birthplace of one of the most important and famous people in Serbian history, one of the leaders of the First Serbian Uprising, Stevan Sinđelić. A statue in his honor was raised in the central square of Svilajnac.