Kostomłoty [kɔstɔmˈwɔtɨ] is a village (former city) in Środa Śląska County, Lower Silesian Voivodeship, in south-western Poland.

About a kilometre from the village there lies the junction of the A4 autostrada with the National road 5.

The 274 railway line runs to the south-west of Kostomłoty, the nearest station is located 12.5 kilometres (7.8 mi) to the east, in Kąty Wrocławskie.

The German name Kostenblut is the phonological adaptation of the earlier Slavic form.

The existence of the phonologically similar German words kosten (to cost) and Blut (blood) played a role in adapting this name.