Nowadays, researches on the UGV usage for agricultural industry are done intensively. UGVs can be applied in agricultural industry sector due to its flexible operation and its suitable shape for agricultural field conditions. An important factor in the UGV operation on agricultural field is the controlling of UGV motion velocity. Directly, the UGV motion velocity is determined by the angular velocity of the dc motors used as the UGV propulsion motor on its wheels. This paper aims to describe the control system design for controlling the UGV propulsion dc motor speed. The UGV control is designed by using the PID control system where based on the trial and error method the PID gains are obtained as follows, KP = 0.03, KI = 0.0000001, and KD = 0.005. The UGV velocity is tested by using two input commands on its programming as the angular velocity. Based on the control system testing with two input commands of 5500 RPM and 4500 RPM, it is obtained that UGV can move on a straight path with constant velocity at 0.528 m/s and 0.431 m/s. The input commands on the UGV programing in RPM values on the designed control system resulting in the proper dc motor speed controller compare to the input commands in PWM values directly to operate the dc motor.