Kostrza [ˈkɔstʂa] is a village in the administrative district of Gmina Strzegom, within Świdnica County, Lower Silesian Voivodeship, in south-western Poland.

The village was founded by Slavic Lechitic tribes in the Early Middle Ages, and there is an archaeological site from that period in Kostrza.

During World War II, in 1940, a forced labour subcamp of the Sachsenhausen concentration camp was established by Nazi Germany at a granite quarry north of the village, which in the following year was converted into the Gross-Rosen concentration camp.

There was also a forced labour subcamp of the Stalag VIII-A prisoner-of-war camp for Allied POWs in Kostrza.

[6] There is a local association football club Sokół Kostrza, which plays in the lower divisions.