The Strei () is a left tributary of the river Mureàin Transylvania, Romania. The upper reach of the river, upstream of the village of Baru, is also known as Râul Petros. It flows through the town CÃÂlan and the villages Petros, Baru, Livadia, Pui, GalaÃÂi, BÃÂieÃÂti, Ohaba de sub PiatrÃÂ, Ciopeia, Subcetate, Covragiu, Bretea RomânÃÂ, Bretea Streiului, RuÃÂi, Strei, Streisângeorgiu, Batiz, BÃÂcia and Simeria Veche. It discharges into the Mureànear Simeria. Its length is and its basin size is .
The following rivers are tributaries to the river Strei (from source to mouth):