Embodiments of the inventive concept relate to an apparatus and a method for removing a liquid residing on a substrate. The substrate treating apparatus includes a substrate support unit configured to support the substrate, a liquid supply unit configured to supply a liquid onto the substrate supported by the substrate support unit, and a heating unit configured to heat the substrate supported by the substrate support unit, wherein the substrate support unit includes a support plate having a seating surface, on which the substrate is seated, and having a suction hole on the seating surface, a rotary shaft configured to rotate the support plate, and a vacuum member configured to reduce a pressure of the suction hole such that the substrate seated on the seating surface is vacuum-suctioned on the support plate. Accordingly, the drying efficiency of the substrate may be increased.