<p>The increasing advancement of modern radar systems and uncontrolled electromagnetic radiation necessitates the development of effective materials that can absorb and attenuate electromagnetic waves. This research explores the development of high-performance microwave absorbing materials using advanced ceramic composites to mitigate these factors. This work investigates the microwave absorption properties of boron carbide (B₄C) composites, incorporating multi-walled carbon nanotubes (MWCNT). Subsequently, the B₄C/MWCNT composite material was prepared by adding 0.5–2.5 wt% MWCNT. Characterization techniques, including XRD, SEM, VSM, TEM, and VNA, were employed to analyze the structural, morphological, magnetic, and electromagnetic properties of the developed materials. Different duration milling results in an increase in microwave absorption, the minimum reflection loss was shown by the sample milled for 8 h, and maximum absorption bandwidth was achieved with the sample milled for 10 h. B₄C/MWCNT composites were prepared and showed improvement in microwave absorption and absorption bandwidth. This improvement is attributed to the high conduction losses, increase in the electrical length of the wave propagation, and enhance interfacial polarization with the addition of MWCNT. The best results were shown by the sample with 2 wt% MWCNT content, having a minimum reflection loss (RL) of −&#xa0;41.30 dB with a 5.42 GHz absorption bandwidth (RL &lt; −&#xa0;10 dB) at 3.5 mm sample thickness. To further improve the absorption bandwidth and reduce the sample thickness, double-layer microwave absorption design was optimized using the genetic algorithm tool in MATLAB. Results showed that double layering of B₄C with 2.5 wt% MWCNT and B₄C with a total thickness of 2.5 mm, improved the microwave absorption to −&#xa0;27.45 and an absorption bandwidth of 9.6 GHz.</p>