A deceleration control apparatus and method for a vehicle, which performs deceleration control on the vehicle by an operation of a brake system which applies a braking force to the vehicle and a shift operation which shifts a transmission of the vehicle into a relatively low speed or speed ratio, performs the shift operation and the operation of the brake system such that a target deceleration set based on a curvature or curvature radius of a curve in a road ahead of the vehicle, a distance to the curve, and a vehicle speed, acts on the vehicle. As a result, a desired deceleration according to the distance to the curve is able to be applied to the vehicle.