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Flexible Fe 3 Si/SiC ultrathin fiber mats have been fabricated by electrospinning and high temperature treatment (1400 °C) using polycarbosilane (PCS) and ferric acetylacetonate (Fe(acac) 3 ) as precursors. The crystallization degree, flexibility, electrical conductivity, dielectric loss and microwave absorption properties of the hybrid fibers have been dramatically enhanced by the introduction of Fe. Fe 3 Si nanoparticles with a diameter around 500 nm are embedded in SiC fibers. As the Fe 3 Si content increases from 0 to 6.5 wt%, the related saturation magnetization ( M s ) values increase from 0 to 8.4 emu g -1 , and the electrical conductivity rises from 7.9 × 10 -8 to 3.1 × 10 -3 S cm -1 . Moreover, the flexibility of Fe 3 Si/SiC hybrid fiber mats is greatly improved and remains intact after 500 times 180°-bending testing. Compared with pure SiC fibers, the Fe 3 Si/SiC hybrid fibers process higher dielectric and magnetic loss, which would be further advanced as more Fe 3 Si phase is introduced. At the optimal Fe 3 Si content of 3.8 wt%, the Fe 3 Si/SiC fibers/silicon resin composite (5 wt%) exhibits minimal reflection loss (RL) of -22.5 dB at 16.5 GHz and 2.5 mm thickness with a wide effective absorption bandwidth (EAB, RL < -10 dB) of 8.5 GHz. The microwave absorption performance can be further promoted by multi component stacking fiber mat composites which contain both low and high Fe 3 Si content layers. Furthermore, the position of the microwave absorption bands can also be simply manipulated by designing the stacking components and structure., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)