STZ may refer to:
Snowbird Tectonic Zone, a geological boundary in the Canadian Shield Stalingrad Tractor Factory (Russian: Stalingradskiy traktornyy zavod), now known as Volgograd Tractor Factory Stanozolol (STZ), an anabolic steroid Streptozotocin (streptozocin, STZ, Zanosar) is a naturally occurring chemical STZ, NYSE ticker symbol for Constellation Brands STZ TV, a Brazilian TV station