In this investigation, the elastic modulus of hybrid particle/short-ยฎber/polymer composites was studied using the rule of hybrid mixtures (RoHM) equation and the laminate analogy approach (LAA). In the RoHM, such a hybrid composite was treated as a hybrid system consisting of two separate single systems, namely particle/polymer system and short-ยฎber/polymer system. Thus, no interaction between particles and short-ยฎbers could be considered. Then, the elastic modulus of the hybrid composite was evaluated from that of the two single systems using the RoHM. In the LAA, particle-ยฎlled polymer was regarded as an effective-matrix. The interaction between particles and short-ยฎbers was incarnated in a manner that short-ยฎbers were incorporated into the effective-matrix containing particles. The modulus of the short-ยฎber reinforced effective-matrix composite was then estimated using the LAA. In addition, the two approaches were applied to previous experimental results. It was interestingly observed that the predicted values by the LAA and the experimental results for the elastic modulus of hybrid particle/short-ยฎber/polymer composites were consistently higher than those predicted by the RoHM, suggesting that the modulus of hybrid particle/short-ยฎber/polymer composites shows a positive hybrid effect.