The effect of dispersion processes on complex permittivity ðe 0 2je 00 Þ and microwave absorption in 2218 GHz ranges is presented for nanocomposites loaded with different amounts of carbon nanotubes (CNTs) ranging from 1 to 5 wt %. The ultrasonic sonication (US) method and the three-roll mill (TRM) method were performed for the manufacturing of the CNT/epoxy absorbers with different dispersing levels. Microscopic observations revealed that the CNT agglomerates were reduced after the TRM process, and individual CNTs were uniformly dispersed in the epoxy resin. For the same weight content of CNT fillers, the percentage increase of e 0 between US and TRM samples varies from 35.5% to 101.7% while the corresponding increment of e 00 (dielectric loss) varies from 79.6% to 248.8%. A minimum reflection loss for the US sample with 2 wt % CNTs is only 27.8 dB at 11.3 GHz while the corresponding TRM sample is greatly improved to reach 237.4 dB at 7.76 GHz for the same matching thickness of 3 mm.