聚氮化硫，化学式(SN)_x，是一种人工合成的纯单晶体无机聚合物，由硫、氮原子相间的链构成。

它的一些共振式如下：

Polythiazyl (polymeric sulfur nitride), (SN)_x, is an electrically conductive, gold- or bronze-colored polymer with metallic luster. It was the first conductive inorganic polymer discovered, and was also found to be a superconductor at very low temperatures (below 0.26 K).