Disclosed herein is a refrigerator, and more particularly, to a refrigerator including a water supply system. The refrigerator includes a main body including a storage compartment, and a water supply assembly disposed in the storage compartment. The water supply assembly includes a first filter mounting portion provided to allow a first filter to be mounted thereon, and a second filter mounting portion provided to allow a second filter to be mounted thereon, and including a residual water guide configured to guide residual water in the second filter mounting portion to the first filter mounting portion.