Rajčanka or Rajčianka (Hungarian: Rajcsánka) is a river in northern Slovakia springing in Strážovské vrchy near Čičmany and pouring into Váh in Žilina.

[1] It forms the border of Lúčanská Malá Fatra Mountains and of Strážovské vrchy.

Cities along its course are: Rajec, Rajecké Teplice, Žilina.

The original name of the river was Lietava, later Žilinka and only after the founding of Rajec (the 14th century) also Rajčanka[2] (see also Etymology of Rajec).

This article related to a river in Slovakia is a stub.