Growing awareness that uncomfortable agricultural vehicles endanger the health of the operators and stricter norms concerning this, make the design of an effective cabin suspension inevitable on agricultural vehicles. The comfort problem originates from the vibrations transmitted to the driver caused by the unevenness of the road or soil profile. This paper investigates the effect a passive and semi-active cabin suspension has on the comfort of the drivers. By optimizing the parameters of the passive suspension and those of the semi-active control laws, satisfactory improvement of the comfort can be achieved.