Provided are an ice maker and a refrigerator including the same. The ice maker for making ice is provided on a rear side of a refrigerator door. A tray cover, a water flood prevention rib, and a rotation guide are provided to prevent flooding of water stored in an ice tray forming the ice maker while the refrigerator door is opened/closed. According to the ice maker and the refrigerator, reduction in a storage capacity of the refrigerator is prevented, flooding of water for making ice is prevented, and the ice maker can be more easily used.