In this review, an overview of polymer and carbon nanotube composite is presented with special emphasis on their applications in technical fields. The general applications of polymer/carbon nanotube nanocomposite in actuators, sensors, sporting goods, and so on have been discussed. In addition, special features of epoxy and epoxy/carbon nanotube composites were discussed in detail. Enhancement in the characteristic features of epoxy matrix with the incorporation of carbon nanotube has been observed. Consequently, the main focus of the review is on applications of epoxy/carbon nanotube composites in different fields such as aerospace, automobiles, fuel cells, radar-absorbing material, wind turbine blades, and electromagnetic interface shielding. [GRAPHICS]